diff --git a/app/app.c b/app/app.c
index 65a078b5..52b6bcb8 100644
--- a/app/app.c
+++ b/app/app.c
@@ -2313,6 +2313,9 @@ static void APP_ProcessKey(const key_code_t Key, const bool key_pressed, const b
 		}
 	}
 
+	#pragma GCC diagnostic push
+	#pragma GCC diagnostic ignored "-Wtype-limits"
+
 	if ((Key >= KEY_0 && Key <= KEY_9) || Key == KEY_F)
 	{
 		if (g_scan_state_dir != SCAN_OFF || g_css_scan_mode != CSS_SCAN_MODE_OFF)
@@ -2323,6 +2326,8 @@ static void APP_ProcessKey(const key_code_t Key, const bool key_pressed, const b
 		}
 	}
 
+	#pragma GCC diagnostic pop
+
 	if (Key == KEY_PTT && g_ptt_was_pressed)
 	{
 		flag = key_held;
@@ -2338,20 +2343,20 @@ static void APP_ProcessKey(const key_code_t Key, const bool key_pressed, const b
 	// to this causing key releases to be totally ignored :( .. 1of11
 	if (Key != KEY_PTT && g_ptt_was_released)
 	{
-/*		if (key_held)
+		if (key_held)
 			flag = true;
 
-		if (!key_pressed)
+//		if (!key_pressed)
+		if (key_pressed)	// I now use key released for button press detections
 		{
 			flag = true;
-*/
 			g_ptt_was_released = false;
-/*		}
+		}
 
 		#if defined(ENABLE_UART) && defined(ENABLE_UART_DEBUG)
 			UART_printf("proc key 1 %3u %u %u %u %u\r\n", Key, key_pressed, key_held, g_fkey_pressed, flag);
 		#endif
-*/
+
 	}
 
 	if (g_fkey_pressed && (Key == KEY_PTT || Key == KEY_EXIT || Key == KEY_SIDE1 || Key == KEY_SIDE2))
diff --git a/app/main.c b/app/main.c
index 56166415..b09f4f25 100644
--- a/app/main.c
+++ b/app/main.c
@@ -821,28 +821,25 @@ void MAIN_ProcessKeys(key_code_t Key, bool key_pressed, bool key_held)
 		}
 	#endif
 
-	if (g_dtmf_input_mode && key_pressed && !key_held)
+	if (g_dtmf_input_mode)
 	{
-		const char Character = DTMF_GetCharacter(Key);
-		if (Character != 0xFF)
-		{	// add key to DTMF string
-			DTMF_Append(Character);
-			g_key_input_count_down   = key_input_timeout_500ms;
-			g_request_display_screen = DISPLAY_MAIN;
-			
-//			g_ptt_was_released       = true;  // why is this being set ?
-
-			g_beep_to_play           = BEEP_1KHZ_60MS_OPTIONAL;
-			return;
+		if (key_pressed && !key_held)
+		{
+			const char Character = DTMF_GetCharacter(Key);
+			if (Character != 0xFF)
+			{	// add key to DTMF string
+	
+				DTMF_Append(Character);
+	
+				g_key_input_count_down   = key_input_timeout_500ms;
+//				g_ptt_was_released       = true;  // why is this being set ?
+				g_beep_to_play           = BEEP_1KHZ_60MS_OPTIONAL;
+				g_request_display_screen = DISPLAY_MAIN;
+			}
 		}
+		return;
 	}
 
-	// TODO: ???
-//	if (Key > KEY_PTT)
-//	{
-//		Key = KEY_SIDE2;      // what's this doing ???
-//	}
-
 	switch (Key)
 	{
 		case KEY_0:
diff --git a/app/menu.c b/app/menu.c
index 380458d1..217881ea 100644
--- a/app/menu.c
+++ b/app/menu.c
@@ -1264,6 +1264,9 @@ static void MENU_Key_0_to_9(key_code_t Key, bool key_pressed, bool key_held)
 
 		if (g_edit_index < 10)
 		{
+			#pragma GCC diagnostic push
+			#pragma GCC diagnostic ignored "-Wtype-limits"
+
 			if (Key >= KEY_0 && Key <= KEY_9)
 			{
 				g_edit[g_edit_index] = '0' + Key - KEY_0;
@@ -1276,6 +1279,8 @@ static void MENU_Key_0_to_9(key_code_t Key, bool key_pressed, bool key_held)
 
 				g_request_display_screen = DISPLAY_MENU;
 			}
+
+			#pragma GCC diagnostic pop
 		}
 
 		return;
diff --git a/driver/keyboard.h b/driver/keyboard.h
index 75e8c887..5776e6f6 100644
--- a/driver/keyboard.h
+++ b/driver/keyboard.h
@@ -22,8 +22,7 @@
 #include <stdint.h>
 
 enum key_code_e {
-	KEY_INVALID = 0,
-	KEY_0,      // DTMF 0
+	KEY_0 = 0,  // DTMF 0
 	KEY_1,      // DTMF 1
 	KEY_2,      // DTMF 2
 	KEY_3,      // DTMF 3
@@ -42,7 +41,7 @@ enum key_code_e {
 	KEY_PTT,    //
 	KEY_SIDE2,  //
 	KEY_SIDE1,  //
-//	KEY_INVALID //
+	KEY_INVALID //
 };
 typedef enum key_code_e key_code_t;
 
diff --git a/firmware.bin b/firmware.bin
index 9eea6fd1..5700e8aa 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index 55734038..17795006 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ
diff --git a/ui/inputbox.c b/ui/inputbox.c
index d002c60b..f504268c 100644
--- a/ui/inputbox.c
+++ b/ui/inputbox.c
@@ -29,7 +29,12 @@ void INPUTBOX_Append(const key_code_t Digit)
 	if (g_input_box_index == 0)
 		memset(g_input_box, 10, sizeof(g_input_box));
 
+	#pragma GCC diagnostic push
+	#pragma GCC diagnostic ignored "-Wtype-limits"
+
 	if (Digit >= KEY_0 && Digit != KEY_INVALID)
 		g_input_box[g_input_box_index++] = (char)(Digit - KEY_0);
+
+	#pragma GCC diagnostic pop
 }