diff --git a/debianito.sh b/debianito.sh
index ae2a47b..4e4f323 100644
--- a/debianito.sh
+++ b/debianito.sh
@@ -32,6 +32,8 @@ source "${MODULES_DIR}/repos.sh"
 [ -f "${MODULES_DIR}/rescue.sh" ]    && source "${MODULES_DIR}/rescue.sh"
 [ -f "${MODULES_DIR}/swap.sh" ]     && source "${MODULES_DIR}/swap.sh"
 [ -f "${MODULES_DIR}/desktop_display.sh" ] && source "${MODULES_DIR}/desktop_display.sh"
+[ -f "${MODULES_DIR}/system/system_prefs.sh" ] && source "${MODULES_DIR}/system/system_prefs.sh"
+[ -f "${MODULES_DIR}/system/audio.sh" ] && source "${MODULES_DIR}/system/audio.sh"
 
 # ── Bullseye-specific modules (loaded only on Debian 11) ──
 if [ -d "${MODULES_DIR}/bullseye" ]; then
@@ -60,24 +62,26 @@ main_menu() {
             $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
             "1" "System Information" \
             "2" "User Privileges & Feedback" \
-            "3" "Configure Repositories" \
-            "4" "Firmware, Wireless & Bluetooth" \
-            "5" "Graphics Drivers & Mesa Stack" \
-            "6" "Kernel" \
-            "7" "Gaming Setup" \
-            "8" "ZRAM" \
-            "9" "Swap Management" \
-            "10" "Install Programs and Software" \
-            "11" "Boot Rescue + GRUB" \
-            "12" "Desktop & Display" \
-            "13" "Exit")
+            "3" "System Preferences" \
+            "4" "Configure Repositories" \
+            "5" "Firmware, Wireless & Bluetooth" \
+            "6" "Graphics Drivers & Mesa Stack" \
+            "7" "Kernel" \
+            "8" "Gaming Setup" \
+            "9" "ZRAM" \
+            "10" "Swap Management" \
+            "11" "Install Programs and Software" \
+            "12" "Boot Rescue + GRUB" \
+            "13" "Desktop & Display" \
+            "14" "Exit")
 
         clear
 
         case "$choice" in
             1)  _show_sysinfo ;;
             2)  config_sudo || true ;;
-            3)
+            3)  _system_preferences_menu ;;
+            4)
                 if [ "$DEBIAN_VERSION" = "11" ] && type configure_repos_bullseye &>/dev/null; then
                     configure_repos_bullseye || true
                 else
@@ -85,14 +89,14 @@ main_menu() {
                 fi
                 STATE_REFRESHED=true
                 ;;
-            4)
+            5)
                 if [ "$DEBIAN_VERSION" = "11" ] && type install_firmware_bullseye &>/dev/null; then
                     install_firmware_bullseye || true
                 else
                     install_firmware || true
                 fi
                 ;;
-            5)
+            6)
                 local gpu_sub
                 gpu_sub=$(_menu "Graphics Drivers" "" 12 50 2 \
                     "1" "Radeon/Intel Mesa" \
@@ -105,8 +109,8 @@ main_menu() {
                 esac
                 STATE_REFRESHED=true
                 ;;
-            6)  show_kernel_menu || true ;;
-            7)
+            7)  show_kernel_menu || true ;;
+            8)
                 if [ "$DEBIAN_VERSION" = "11" ] && type install_gaming_bullseye &>/dev/null; then
                     install_gaming_bullseye || true
                 else
@@ -114,18 +118,18 @@ main_menu() {
                 fi
                 STATE_REFRESHED=true
                 ;;
-            8)  zram_menu || true ;;
-            9)  manage_swap || true; STATE_REFRESHED=true ;;
-            10)
+            9)  zram_menu || true ;;
+            10) manage_swap || true; STATE_REFRESHED=true ;;
+            11)
                 if [ "$DEBIAN_VERSION" = "11" ] && type install_extras_bullseye &>/dev/null; then
                     install_extras_bullseye || true
                 else
                     install_extras || true
                 fi
                 ;;
-            11) rescue_boot || true ;;
-            12) manage_desktop_display || true ;;
-            13) echo "Exiting."; exit 0 ;;
+            12) rescue_boot || true ;;
+            13) manage_desktop_display || true ;;
+            14) echo "Exiting."; exit 0 ;;
         esac
         if $STATE_REFRESHED; then
             refresh_system_state
diff --git a/modules/desktop_display.sh b/modules/desktop_display.sh
index 7b65e23..396731c 100644
--- a/modules/desktop_display.sh
+++ b/modules/desktop_display.sh
@@ -11,13 +11,130 @@ manage_desktop_display() {
         [ -z "$choice" ] && break
         clear
         case "$choice" in
-            1) _msg "Coming Soon" "Desktop Environment management will be available in a future update." 10 60 ;;
+            1) desktop_environment_menu ;;
             2) display_manager_menu ;;
             3) break ;;
         esac
     done
 }
 
+desktop_environment_menu() {
+    while true; do
+        local -a env_items=()
+        env_items+=("1" "XFCE")
+        env_items+=("2" "Back")
+        # Future desktop environments: add "2" "GNOME", "3" "KDE", ... here
+        # and a matching case below calling its own menu (e.g. gnome_menu).
+        local choice
+        choice=$(_menu "Desktop Environment" \
+            "Select a desktop environment:" $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
+            "${env_items[@]}")
+        [ -z "$choice" ] && break
+        clear
+        case "$choice" in
+            1) xfce_menu ;;
+            2) break ;;
+        esac
+    done
+}
+
+xfce_menu() {
+    while true; do
+        local -a xf_items=()
+        xf_items+=("1" "XFCE (Full Meta Package)")
+        xf_items+=("2" "XFCE (Minimal Core)")
+        [ "$DEBIAN_VERSION" = "13" ] && xf_items+=("3" "XFCE Wayland (Experimental — labwc)")
+        xf_items+=("4" "XFCE Custom (Choose packages)")
+        xf_items+=("5" "Back")
+        local choice
+        choice=$(_menu "XFCE" \
+            "Select an option:" $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
+            "${xf_items[@]}")
+        [ -z "$choice" ] && break
+        clear
+        case "$choice" in
+            1) _install_xfce_full ;;
+            2) _install_xfce_minimal ;;
+            3) _install_xfce_wayland ;;
+            4) _install_xfce_custom ;;
+            5) break ;;
+        esac
+    done
+}
+
+_install_xfce_full() {
+    _run_cmd "XFCE Full" "sudo apt install -y xfce4 xfce4-goodies xfce4-power-manager" \
+        "Installing XFCE (Full Meta Package)..."
+    _xfce_polkit_rules
+}
+
+_install_xfce_minimal() {
+    _run_cmd "XFCE Minimal" "sudo apt install -y xfce4" \
+        "Installing XFCE (Minimal Core)..."
+    _xfce_polkit_rules
+}
+
+_install_xfce_wayland() {
+    _run_cmd "XFCE Wayland" "sudo apt install -y xfce4 labwc" \
+        "Installing XFCE + labwc (Wayland, experimental)..."
+    _msg "XFCE Wayland" "labwc is EXPERIMENTAL on XFCE 4.20.\n\nAfter reboot, select the Wayland session\nfrom the login screen." 12 65
+    _xfce_polkit_rules
+}
+
+_install_xfce_custom() {
+    local -a items=()
+    for pkg in thunar xfdesktop4 xfwm4 xfce4-panel xfce4-terminal \
+        xfce4-screenshooter ristretto mousepad xfce4-session \
+        xfce4-settings xfce4-power-manager; do
+        items+=("$pkg" "$pkg" "$(_state "$pkg")")
+    done
+    local choices
+    choices=$(_checklist "XFCE Custom" \
+        "Select the XFCE packages to install:" $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
+        "${items[@]}")
+    [ -z "$choices" ] && return
+    local cleaned
+    cleaned=$(echo "$choices" | tr -d '"')
+    [ -z "$cleaned" ] && return
+    _run_cmd "XFCE Custom" "sudo apt install -y $cleaned" \
+        "Installing selected XFCE packages..."
+    _xfce_polkit_rules
+}
+
+_xfce_polkit_rules() {
+    is_installed xfce4-power-manager || return 0
+
+    local rules_dir="/etc/polkit-1/rules.d"
+    sudo mkdir -p "$rules_dir"
+
+    cat <<'EOF' | sudo tee "$rules_dir/85-suspend.rules" >/dev/null
+polkit.addRule(function(action, subject) {
+    if (action.id == "org.freedesktop.login1.suspend" &&
+        subject.isInGroup("users")) {
+        return polkit.Result.YES;
+    }
+});
+EOF
+    cat <<'EOF' | sudo tee "$rules_dir/89-backlight.rules" >/dev/null
+polkit.addRule(function(action, subject) {
+    if (action.id == "org.freedesktop.upower.backlight" &&
+        subject.isInGroup("backlight")) {
+        return polkit.Result.YES;
+    }
+});
+EOF
+
+    if ! getent group backlight >/dev/null 2>&1; then
+        sudo groupadd --system backlight || true
+    fi
+    local de_user="${SUDO_USER:-$USER}"
+    if [ -n "$de_user" ] && ! id -nG "$de_user" 2>/dev/null | grep -qw backlight; then
+        sudo usermod -aG backlight "$de_user" || true
+    fi
+    sudo systemctl restart polkit.service 2>/dev/null || true
+    echo -e "${GREEN}Polkit rules installed (suspend + backlight). User '${de_user}' added to 'backlight' group.${NC}"
+}
+
 display_manager_menu() {
     while true; do
         local -a dm_items=()
diff --git a/modules/extras.sh b/modules/extras.sh
index 053ab85..b6707b9 100644
--- a/modules/extras.sh
+++ b/modules/extras.sh
@@ -43,8 +43,7 @@ install_extras() {
             "11" "Office & Productivity" \
             "12" "System Tools" \
             "13" "Fetch / System Info" \
-            "14" "Audio & Sound" \
-            "15" "Back to main menu")
+            "14" "Back to main menu")
 
         [ -z "$cat_choice" ] && return
         clear
@@ -64,8 +63,7 @@ install_extras() {
             11) _cat_office ;;
             12) _cat_general ;;
             13) _cat_fetch ;;
-            14) _cat_audio ;;
-            15) return ;;
+            14) return ;;
         esac
         clear
     done
diff --git a/modules/extras/internet/internet.sh b/modules/extras/internet/internet.sh
index d1179fc..707a01d 100644
--- a/modules/extras/internet/internet.sh
+++ b/modules/extras/internet/internet.sh
@@ -183,9 +183,24 @@ _cat_internet() {
 
     local cleaned; cleaned=$(echo "$choices" | tr -d '"')
 
-    if echo "$cleaned" | grep -q "firefox" && echo "$cleaned" | grep -q "firefox-esr"; then
-        _msg "Firefox" "You selected both Firefox (Mozilla) and Firefox ESR.\nPlease choose only one Firefox variant." 10 60
-        return
+    local has_firefox=false
+    local has_firefox_esr=false
+    for _p in $cleaned; do
+        [ "$_p" = "firefox" ] && has_firefox=true
+        [ "$_p" = "firefox-esr" ] && has_firefox_esr=true
+    done
+
+    if $has_firefox && $has_firefox_esr; then
+        local fchoice
+        fchoice=$(_menu "Firefox" "You selected both Firefox (Mozilla) and Firefox ESR.\nWhat do you want to do?" 12 60 3 \
+            "mozilla" "Remove Firefox ESR — keep Firefox" \
+            "esr"     "Remove Firefox — keep Firefox ESR" \
+            "both"    "Keep both variants")
+        [ -z "$fchoice" ] && return
+        case "$fchoice" in
+            mozilla) cleaned=$(printf '%s\n' $cleaned | grep -vx "firefox-esr" | tr '\n' ' ') ;;
+            esr)     cleaned=$(printf '%s\n' $cleaned | grep -vx "firefox" | tr '\n' ' ') ;;
+        esac
     fi
 
     for pkg in $cleaned; do
diff --git a/modules/gpu.sh b/modules/gpu.sh
index 9776d63..5876917 100644
--- a/modules/gpu.sh
+++ b/modules/gpu.sh
@@ -191,12 +191,19 @@ _install_nvidia_stack() {
 
     NVIDIA_DRIVER_MODE=""
 
-    if ! _nvidia_manage_menu; then
-        return
+    if _nvidia_driver_installed; then
+        if ! _nvidia_manage_menu; then
+            return
+        fi
     fi
 
     if [ "$DEBIAN_VERSION" = "11" ]; then
-        install_nvidia_bullseye
+        if type install_nvidia_bullseye &>/dev/null; then
+            install_nvidia_bullseye
+        else
+            _msg "NVIDIA — Bullseye" "The Bullseye NVIDIA module is not available.\n\nNo NVIDIA driver was installed." 10 60
+            NVIDIA_DRIVER_MODE=""
+        fi
 
     else
         if ! _show_nvidia_version_menu; then
@@ -230,7 +237,9 @@ _install_nvidia_stack() {
                         NVIDIA_DRIVER_MODE=""
                         ;;
                     blackwell)
-                        _install_nvidia_cuda_repo
+                        _msg "NVIDIA — Blackwell (v550)" \
+                            "Your Blackwell GPU is NOT supported by the official\nDebian v550 driver.\n\nPlease select v590 or v595 (NVIDIA CUDA Repo)\nin the driver menu." 14 65
+                        NVIDIA_DRIVER_MODE=""
                         ;;
                     maxwell|pascal|volta)
                         if [ "$(is_backports_kernel)" = "true" ]; then
@@ -253,7 +262,7 @@ Forcing the stable driver path." 14 70
                             _install_nvidia_standard
                         fi
                         ;;
-                    turing|ampere|ada|blackwell)
+                    turing|ampere|ada)
                         _install_nvidia_standard
                         ;;
                     *)
diff --git a/modules/gpu/nvidia_manage.sh b/modules/gpu/nvidia_manage.sh
index 76c2fc5..bc5f8c1 100644
--- a/modules/gpu/nvidia_manage.sh
+++ b/modules/gpu/nvidia_manage.sh
@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 # nvidia_manage.sh — NVIDIA management menu: install/change or remove
 
+_nvidia_driver_installed() {
+    dpkg -l 2>/dev/null | grep -qE "^ii  (nvidia-driver|nvidia-tesla-470-driver|nvidia-open|nvidia-kernel-dkms|nvidia-kernel-open-dkms|nvidia-open-kernel-dkms)"
+}
+
 _nvidia_manage_menu() {
     local choice
     choice=$(_menu "NVIDIA Driver" "Manage NVIDIA Driver" 12 70 4 \
@@ -22,7 +26,7 @@ _nvidia_manage_menu() {
 }
 
 _nvidia_remove() {
-    if ! dpkg -l 2>/dev/null | grep -qE "^ii  (nvidia-driver|nvidia-tesla-470-driver|nvidia-open-kernel-dkms|nvidia-kernel-dkms)"; then
+    if ! _nvidia_driver_installed; then
         echo -e "${YELLOW}NVIDIA driver is not installed on this system.${NC}"
         return 0
     fi
@@ -33,7 +37,7 @@ _nvidia_remove() {
     fi
 
     echo "Removing NVIDIA driver packages..."
-    sudo apt purge -y nvidia-driver nvidia-kernel-dkms nvidia-open-kernel-dkms nvidia-tesla-470-driver nvidia-settings nvidia-vaapi-driver firmware-nvidia-gsp mesa-vdpau-drivers || true
+    sudo apt purge -y nvidia-driver nvidia-kernel-dkms nvidia-open-kernel-dkms nvidia-open nvidia-kernel-open-dkms nvidia-tesla-470-driver nvidia-settings nvidia-vaapi-driver firmware-nvidia-gsp mesa-vdpau-drivers nvidia-driver-pinning-* || true
 
     echo "Cleaning up dependencies..."
     sudo apt autoremove --purge -y || true
diff --git a/modules/kernel.sh b/modules/kernel.sh
index 585c926..00e4ec2 100644
--- a/modules/kernel.sh
+++ b/modules/kernel.sh
@@ -4,7 +4,7 @@
 show_kernel_menu() {
     while true; do
         local items=("stable" "Install linux-image-amd64")
-        [ "$DEBIAN_VERSION" != "11" ] && items+=("backports" "Install from backports")
+        [ "$DEBIAN_VERSION" = "13" ] && items+=("backports" "Install from backports")
         items+=("rt" "Install linux-image-rt-amd64 (Preempt-RT)")
         items+=("cloud" "Install linux-image-cloud-amd64")
         items+=("back" "Return to main menu")
diff --git a/modules/system/audio.sh b/modules/system/audio.sh
new file mode 100644
index 0000000..aec8f70
--- /dev/null
+++ b/modules/system/audio.sh
@@ -0,0 +1,185 @@
+#!/usr/bin/env bash
+# audio.sh — Audio & Sound (PipeWire, ALSA, PulseAudio tools)
+
+_prefs_audio_menu() {
+    local headless=false
+    _is_headless && headless=true
+
+    local -a items=()
+
+    local pw_label="PipeWire Audio Stack (Bluetooth Hi-Res)"
+
+    local pw_state; pw_state=$(_state "pipewire-audio")
+    items+=(
+        "pipewire-audio" "$pw_label" "$pw_state"
+    )
+
+    local alsa_state; alsa_state=$(_state "alsa-utils")
+    items+=(
+        "alsa-utils" "ALSA Utilities (alsa-utils, alsa-ucm-conf)" "$alsa_state"
+    )
+
+    if ! $headless; then
+        local pavu_state; pavu_state=$(_state "pavucontrol")
+        items+=(
+            "pavucontrol" "Volume Control GUI (pavucontrol)" "$pavu_state"
+        )
+    fi
+
+    local pulsemixer_state; pulsemixer_state=$(_state "pulsemixer")
+    local playerctl_state;  playerctl_state=$(_state "playerctl")
+    items+=(
+        "pulsemixer" "Terminal audio mixer (pulsemixer)" "$pulsemixer_state"
+        "playerctl"  "Multimedia key controller (playerctl)" "$playerctl_state"
+    )
+
+    local item_count=${#items[@]}
+    local lista_alto=$((item_count > TUI_ALTO_LISTA ? TUI_ALTO_LISTA : item_count))
+    local choices
+    choices=$(_checklist "Audio & Sound" "Check [*] the packages you want installed.\n" \
+        $TUI_ALTO $TUI_ANCHO $lista_alto "${items[@]}")
+    clear
+    [ -z "$choices" ] && return
+
+    local cleaned; cleaned=$(echo "$choices" | tr -d '"')
+
+    for pkg in $cleaned; do
+        case $pkg in
+            pipewire-audio) _install_pipewire_standard ;;
+            alsa-utils)
+                if ! is_installed "alsa-utils"; then
+                    _run_install "alsa-utils alsa-ucm-conf"
+                else
+                    echo "alsa-utils already installed."
+                fi
+                ;;
+            pavucontrol)
+                if ! is_installed "pavucontrol"; then
+                    _run_install "pavucontrol"
+                else
+                    echo "pavucontrol already installed."
+                fi
+                ;;
+            pulsemixer)
+                if ! is_installed "pulsemixer"; then
+                    _run_install "pulsemixer"
+                else
+                    echo "pulsemixer already installed."
+                fi
+                ;;
+            playerctl)
+                if ! is_installed "playerctl"; then
+                    _run_install "playerctl"
+                else
+                    echo "playerctl already installed."
+                fi
+                ;;
+        esac
+    done
+
+    echo -e "${GREEN}Audio & Sound setup complete.${NC}"
+}
+
+_install_pipewire_standard() {
+    local bt_pkgs="libldacbt-abr2 libldacbt-enc2 libopenaptx0 libspa-0.2-bluetooth"
+    if apt-cache show libfdk-aac2t64 &>/dev/null; then
+        bt_pkgs+=" libfdk-aac2t64"
+    elif apt-cache show libfdk-aac2 &>/dev/null; then
+        bt_pkgs+=" libfdk-aac2"
+    fi
+
+    # ── Resolve versions (needed for both installed and not-installed branches) ──
+    local stable_ver=""
+    stable_ver=$(apt-cache policy pipewire-audio 2>/dev/null | awk 'NR==3 {print $2; exit}') || true
+    local bpo_ver=""
+    if [ "$DEBIAN_VERSION" = "13" ] && [ "$(is_backports_enabled)" = "true" ]; then
+        bpo_ver=$(apt-cache madison pipewire-audio 2>/dev/null | \
+            grep "${DEBIAN_CODENAME}-backports" | awk '{print $3}' | head -1) || true
+    fi
+
+    local pkg_check="pipewire-audio"
+    [ "$DEBIAN_VERSION" = "11" ] && pkg_check="pipewire"
+
+    # ── Already installed branch ──
+    if is_installed "$pkg_check"; then
+        if [ -n "$bpo_ver" ]; then
+            local current_ver
+            current_ver=$(dpkg -l "$pkg_check" 2>/dev/null | awk '/^ii/{print $3}') || true
+            if _confirm "PipeWire" \
+                "PipeWire ${current_ver:+v${current_ver} }already installed.\n\nUpgrade to backports version v${bpo_ver}?"; then
+                echo "Upgrading PipeWire Audio Stack..."
+                echo "-> Target version: v${bpo_ver} (from ${DEBIAN_CODENAME}-backports)"
+                echo "-> Including Bluetooth Hi-Res codecs (LDAC, aptX, AAC)"
+                _run_cmd "PipeWire" \
+                    "sudo apt install -y --reinstall -t ${DEBIAN_CODENAME}-backports pipewire-audio $bt_pkgs" \
+                    "Upgrading PipeWire from backports..."
+                if [ "$DEBIAN_VERSION" != "11" ]; then
+                    echo "Restarting PipeWire services..."
+                    systemctl --user restart wireplumber pipewire pipewire-pulse 2>/dev/null || true
+                    echo -e "${GREEN}PipeWire services restarted.${NC}"
+                fi
+                return
+            fi
+        fi
+        echo "$pkg_check already installed."
+        return
+    fi
+
+    # ── Confirm dialog ──
+    local apt_target="" pw_ver="" pw_src=""
+    if [ -n "$bpo_ver" ]; then
+        local msg="Backports repository is enabled.\n\n"
+        msg+="Available versions:\n"
+        msg+="  - Stable:   v${stable_ver:-unknown}\n"
+        msg+="  - Backports: v${bpo_ver}\n\n"
+        msg+="Install from Backports (Recommended for newer hardware)\nor from Stable (more conservative)?"
+        if _confirm_custom "PipeWire Install" "$msg" "Backports" "Stable" 14 70; then
+            apt_target="-t ${DEBIAN_CODENAME}-backports"
+            pw_ver="$bpo_ver"
+            pw_src="from ${DEBIAN_CODENAME}-backports"
+        else
+            pw_ver="$stable_ver"
+        fi
+    else
+        local msg="PipeWire Audio Stack (v${stable_ver:-unknown})\n"
+        msg+="will be installed along with Bluetooth Hi-Res\n"
+        msg+="codecs (LDAC, aptX, AAC).\n\n"
+        msg+="Continue with installation?"
+        if ! _confirm "PipeWire Install" "$msg" 12 65; then
+            echo "PipeWire installation cancelled."
+            return
+        fi
+        pw_ver="$stable_ver"
+    fi
+
+    echo "Installing PipeWire Audio Stack..."
+    echo "-> Detected version: ${pw_ver:-unknown} ${pw_src:+($pw_src)}"
+    echo "-> Including Bluetooth Hi-Res codecs (LDAC, aptX, AAC)"
+
+    case "$DEBIAN_VERSION" in
+        11)
+            _run_cmd "PipeWire" \
+                "sudo apt install -y pipewire libspa-0.2-bluetooth pipewire-alsa libspa-0.2-jack $bt_pkgs" \
+                "Installing PipeWire (Bullseye basic mode)..."
+            echo -e "${GREEN}PipeWire installed (Bullseye basic mode).${NC}"
+            ;;
+        12)
+            _run_cmd "PipeWire" \
+                "sudo apt install -y pipewire-audio $bt_pkgs" \
+                "Installing pipewire-audio meta-package (Bookworm)..."
+            echo -e "${GREEN}PipeWire audio stack installed.${NC}"
+            ;;
+        13)
+            _run_cmd "PipeWire" \
+                "sudo apt install -y $apt_target pipewire-audio $bt_pkgs" \
+                "Installing pipewire-audio meta-package (Trixie)..."
+            echo -e "${GREEN}PipeWire audio stack installed.${NC}"
+            ;;
+    esac
+
+    if [ "$DEBIAN_VERSION" != "11" ]; then
+        echo "Restarting PipeWire services..."
+        systemctl --user restart wireplumber pipewire pipewire-pulse 2>/dev/null || true
+        echo -e "${GREEN}PipeWire services restarted.${NC}"
+    fi
+}
diff --git a/modules/system/system_prefs.sh b/modules/system/system_prefs.sh
new file mode 100644
index 0000000..457a607
--- /dev/null
+++ b/modules/system/system_prefs.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# system_prefs.sh — System Preferences: time, locale, keyboard, audio
+
+_prefs_date_time() {
+    echo -e "${YELLOW}Current system date/time:${NC} $(date '+%Y-%m-%d %H:%M')"
+    echo -e "${YELLOW}Timezone:${NC} $(timedatectl show -p Timezone --value 2>/dev/null || echo unknown)"
+
+    if _confirm "Timezone" "Change the system timezone (dpkg-reconfigure tzdata)?"; then
+        sudo env LC_ALL=C LANGUAGE=C dpkg-reconfigure tzdata || true
+        echo -e "${GREEN}Timezone: $(timedatectl show -p Timezone --value 2>/dev/null)${NC}"
+    fi
+    _ensure_time_synced
+}
+
+_prefs_locale_keyboard() {
+    sudo env LC_ALL=C LANGUAGE=C dpkg-reconfigure locales || true
+    sudo env LC_ALL=C LANGUAGE=C dpkg-reconfigure keyboard-configuration || true
+    echo -e "${GREEN}Language, locales and keyboard configured.${NC}"
+}
+
+_prefs_audio() { _prefs_audio_menu; }
+
+_system_preferences_menu() {
+    while true; do
+        local choice
+        choice=$(_menu "System Preferences" "Select a preference group:" \
+            $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
+            "1" "Date, Time & Timezone" \
+            "2" "Language, Locales & Keyboard" \
+            "3" "Audio & Sound Stack" \
+            "4" "Back to main menu")
+        [ -z "$choice" ] && return
+        clear
+        case "$choice" in
+            1) _prefs_date_time ;;
+            2) _prefs_locale_keyboard ;;
+            3) _prefs_audio ;;
+            4) return ;;
+        esac
+    done
+}
\ No newline at end of file
diff --git a/modules/utils.sh b/modules/utils.sh
index a52e9aa..62cd85d 100644
--- a/modules/utils.sh
+++ b/modules/utils.sh
@@ -109,7 +109,7 @@ _ensure_time_synced() {
         if [ -n "${DISPLAY:-}" ] || [ -n "${SSH_TTY:-}" ]; then
             _msg "Timezone" \
                 "Your system timezone is not set or is set to UTC.\n\nThe script will now open the timezone\nconfiguration tool to set your local timezone." 12 60
-            sudo dpkg-reconfigure tzdata
+sudo env LC_ALL=C LANGUAGE=C dpkg-reconfigure tzdata || true
             echo -e "${GREEN}Timezone configured: $(timedatectl show -p Timezone --value 2>/dev/null)${NC}"
         else
             echo -e "${YELLOW}Timezone not set. Run 'sudo dpkg-reconfigure tzdata' later.${NC}"
@@ -163,7 +163,7 @@ detect_debian_version() {
 # CPU and RAM info (cosmetic)
 # ----------------------------------
 detect_cpu_ram() {
-    CPU_SUMMARY=$(grep -m1 'model name' /proc/cpuinfo | sed 's/.*: //')
+    CPU_SUMMARY=$(grep -m1 'model name' /proc/cpuinfo | sed 's/.*: //' || true)
     RAM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')
     RAM_GB=$(awk -v kb="$RAM_KB" 'BEGIN { printf "%.2f", kb / 1048576 }')
     RAM_SUMMARY="${RAM_GB} GB"