diff --git a/examples/companion_radio/ui-new/SettingsScreen.h b/examples/companion_radio/ui-new/SettingsScreen.h
index 3271ffc3..02c18683 100644
--- a/examples/companion_radio/ui-new/SettingsScreen.h
+++ b/examples/companion_radio/ui-new/SettingsScreen.h
@@ -61,6 +61,7 @@ class SettingsScreen : public UIScreen {
     CUSTOM_FREQ, CUSTOM_SF, CUSTOM_BW, CUSTOM_CR,
     POWER_SAVE,
     TX_APC,
+    SCOPE_NAME,
     // System section
     SECTION_SYSTEM,
     DEVICE_NAME,
@@ -555,6 +556,11 @@ class SettingsScreen : public UIScreen {
       // Suppressed (and locked) while repeating — a repeater holds full TX power.
       if (p && p->client_repeat) display.print("--");
       else display.print((p && p->tx_apc) ? "ON" : "OFF");
+    } else if (item == SCOPE_NAME) {
+      display.print("Scope");
+      int vx = valCol(display);
+      display.drawTextEllipsized(vx, y, display.width() - vx - _reserve,
+                                  (p && p->default_scope_name[0]) ? p->default_scope_name : "(none)");
 #if AUTO_OFF_MILLIS > 0
     } else if (item == AUTO_OFF) {
       display.print("AutoOff");
@@ -678,6 +684,7 @@ class SettingsScreen : public UIScreen {
   // Keyboard state for editing message slots
   int            _edit_slot = -1;  // -1 = not editing, 0..9 = slot being edited
   bool           _edit_name = false;  // editing DEVICE_NAME via the keyboard
+  bool           _edit_scope = false; // editing SCOPE_NAME via the keyboard
   KeyboardWidget* _kb;
 
   // Radio preset picker — names are too long for the value column, so Enter on
@@ -701,6 +708,7 @@ public:
   void onShow() override {
     _dirty = false;
     _edit_name = false;
+    _edit_scope = false;
     resetList();
     _editor.freq.active = false;
   }
@@ -708,7 +716,7 @@ public:
   int render(DisplayDriver& display) override {
     display.setTextSize(1);
 
-    if (_edit_slot >= 0 || _edit_name || _picker.saving) {
+    if (_edit_slot >= 0 || _edit_name || _edit_scope || _picker.saving) {
       return _kb->render(display);
     }
 
@@ -771,6 +779,19 @@ public:
       return true;
     }
 
+    // Keyboard editing mode for the scope name
+    if (_edit_scope) {
+      auto res = _kb->handleInput(c);
+      if (res == KeyboardWidget::DONE) {
+        the_mesh.setPrimaryScope(_kb->buf);
+        _dirty = true;
+        _edit_scope = false;
+      } else if (res == KeyboardWidget::CANCELLED) {
+        _edit_scope = false;
+      }
+      return true;
+    }
+
     // Digit-by-digit Freq editor
     if (_editor.active()) {
       if (_editor.handleFreqInput(c) && p) { _task->applyRadioParams(); _dirty = true; }
@@ -966,6 +987,12 @@ public:
       _kb->clearPlaceholders();   // a device name is literal, not a message
       return true;
     }
+    if (_selected == SCOPE_NAME && p && enter) {
+      _edit_scope = true;
+      _kb->begin(p->default_scope_name, (int)sizeof(p->default_scope_name) - 1);
+      _kb->clearPlaceholders();   // a scope name is literal, not a message
+      return true;
+    }
     if (_selected == REBOOT && enter) {
       _task->savePrefsIfDirty(_dirty);   // don't lose pending edits across the restart
       _task->showAlert("Rebooting...", 800);
diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 16b92980..27998072 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -1398,11 +1398,11 @@ void UITask::begin(DisplayDriver* display, SensorManager* sensors, NodePrefs* no
   _auto_off = millis() + (aoff > 0 ? aoff : AUTO_OFF_MILLIS);
 
 #if defined(CARDKB_I2C)
-  // On the ENV_PIN_SDA/SCL path, Wire1 is already brought up by
+  // On the ENV_PIN_SDA/SCL path, CARDKB_I2C is Wire1, already brought up by
   // sensors.begin() (EnvironmentSensorManager), which runs before this. On
-  // the CARDKB_USE_PRIMARY_WIRE path, Wire is already brought up by the
-  // board's own begin() (display/RTC), also before this -- either way, just
-  // probe for a CardKB sitting on the bus.
+  // boards that set CARDKB_I2C=Wire directly in platformio.ini, that bus is
+  // brought up by the board's own begin() instead -- also before this.
+  // Either way, just probe for a CardKB sitting on it.
   CARDKB_I2C.beginTransmission(0x5F);
   _has_cardkb = (CARDKB_I2C.endTransmission() == 0);
 #endif
@@ -2120,7 +2120,7 @@ static const char CARDKB_FN_BASE[48] = {
 };
 #endif
 
-// Poll an optional CardKB (I2C keyboard, addr 0x5F) on Wire1/Grove, feeding
+// Poll an optional CardKB (I2C keyboard, addr 0x5F) on CARDKB_I2C, feeding
 // the same key queue as every physical button. Most of its output needs no
 // translation at all: CardKB's own arrow/Enter/Esc byte codes are already
 // identical to this UI's KEY_LEFT/UP/DOWN/RIGHT/ENTER/CANCEL (0xB4-0xB7, 13,
diff --git a/examples/companion_radio/ui-new/UITask.h b/examples/companion_radio/ui-new/UITask.h
index f96e010d..c3bc058c 100644
--- a/examples/companion_radio/ui-new/UITask.h
+++ b/examples/companion_radio/ui-new/UITask.h
@@ -23,6 +23,21 @@
 #include "../AbstractUITask.h"
 #include "../NodePrefs.h"
 #include "../Trail.h"
+
+// Optional M5Stack CardKB (I2C keyboard, addr 0x5F). CARDKB_I2C names which
+// TwoWire it lives on -- set at file scope (not inside the class body, and
+// not resolved via an #elif ladder) so both this header and SettingsScreen.h
+// see a fully-resolved macro no matter which one gets included first.
+//  - Boards with a free second I2C bus define ENV_PIN_SDA/ENV_PIN_SCL
+//    (already brought up for EnvironmentSensorManager) and get Wire1 here,
+//    same as before.
+//  - Boards without a free second bus set -D CARDKB_I2C=Wire directly in
+//    platformio.ini, sharing whatever bus the display/RTC already use.
+// Either way it's a no-op on boards that define neither, or when nothing
+// ACKs 0x5F at boot.
+#if !defined(CARDKB_I2C) && defined(ENV_PIN_SDA) && defined(ENV_PIN_SCL)
+  #define CARDKB_I2C Wire1
+#endif
 #include "../Waypoint.h"
 #include "../LiveTrack.h"
 #include "KeyboardWidget.h"
@@ -193,20 +208,8 @@ class UITask : public AbstractUITask {
   void enqueueKey(char c);
   bool dequeueKey(char& c);
 
-  // Optional M5Stack CardKB (I2C keyboard, addr 0x5F). Two ways to reach it:
-  //  - ENV_PIN_SDA/ENV_PIN_SCL defined -> CardKB rides the dedicated second
-  //    I2C bus (Wire1) that EnvironmentSensorManager already brings up.
-  //  - CARDKB_USE_PRIMARY_WIRE defined instead -> CardKB shares the board's
-  //    main Wire bus (whatever the display/RTC already use), for boards
-  //    where no second bus is free. Mutually exclusive with the above.
-  // Either way it's a no-op on boards with neither define, or when nothing
-  // ACKs 0x5F at boot.
-#if defined(ENV_PIN_SDA) && defined(ENV_PIN_SCL)
-  #define CARDKB_I2C Wire1
-#elif defined(CARDKB_USE_PRIMARY_WIRE)
-  #define CARDKB_I2C Wire
-#endif
-
+  // Optional M5Stack CardKB (I2C keyboard, addr 0x5F). See the CARDKB_I2C
+  // definition near the top of this file for which bus it's on and why.
 #if defined(CARDKB_I2C)
   bool     _has_cardkb = false;
   // CardKB is level-triggered, not edge-triggered -- it keeps returning the
diff --git a/variants/promicro/platformio.ini b/variants/promicro/platformio.ini
index 01b0d537..83b591b8 100644
--- a/variants/promicro/platformio.ini
+++ b/variants/promicro/platformio.ini
@@ -178,17 +178,21 @@ extends = Promicro
 build_src_filter = ${Promicro.build_src_filter}
   +<../examples/kiss_modem/>
 ; ============================================================
-; Solo build (UI completa on-device) com CardKB no barramento
-; I2C ja usado pelo OLED (SDA=D8, SCL=D7 -- confirmado contra o
-; esquematico oficial da fakeTec V5 rev.B). Requer o patch
-; CARDKB_USE_PRIMARY_WIRE em UITask.h/.cpp e SettingsScreen.h.
+; Solo build (full on-device UI) with CardKB support.
+; CardKB shares the board's primary I2C bus (already used by the
+; OLED display / RTC) instead of a dedicated second bus: the default
+; Wire1 pins on this variant (D13/D14) physically collide with the
+; LoRa SPI bus (P_LORA_NSS=13, P_LORA_MOSI=14), and no other free
+; GPIO pair is broken out on this board for a second dedicated bus.
+; Do NOT define ENV_PIN_SDA/ENV_PIN_SCL here -- that would bring up
+; a real Wire1 on the colliding pins instead.
 ; ============================================================
 [env:ProMicro_companion_solo_dual]
 extends = Promicro
 board_build.ldscript = boards/nrf52840_s140_v6_extrafs.ld
 board_upload.maximum_size = 712704
-; -Ofast (default do core) infla o flash num build solo feature-completo;
-; -Os cabe com folga.
+; -Ofast (the core's default) doesn't fit a feature-complete solo build;
+; -Os fits with headroom.
 build_unflags = -Ofast
 build_flags = ${Promicro.build_flags}
   -I examples/companion_radio/ui-new
@@ -202,9 +206,8 @@ build_flags = ${Promicro.build_flags}
   -D UI_SENSORS_PAGE=1
   -D ENABLE_SCREENSHOT
   -Os
-  ; CardKB compartilhando o barramento do OLED/RTC (D8/D7) --
-  ; NAO definir ENV_PIN_SDA/SCL aqui, colidiria com o LoRa (D13/D14).
-  -D CARDKB_USE_PRIMARY_WIRE=1
+  ; CardKB on the shared primary bus (D8=SDA / D7=SCL on this board).
+  -D CARDKB_I2C=Wire
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${Promicro.build_src_filter}