diff --git a/comm/commands.c b/comm/commands.c
index e69a93a327..753fd16eae 100644
--- a/comm/commands.c
+++ b/comm/commands.c
@@ -321,7 +321,13 @@ void commands_process_packet(unsigned char *data, unsigned int len,
 		if (nrf_driver_ext_nrf_running()) {
 			nrf_driver_pause(6000);
 		}
-		uint16_t flash_res = flash_helper_erase_new_app(buffer_get_uint32(data, &ind));
+		uint16_t flash_res = 100;
+		if (!REJECT_FLASH_LOADING) {
+			flash_res = flash_helper_erase_new_app(buffer_get_uint32(data, &ind));
+		}
+		else {
+			commands_printf("Firmware loading rejected by the controller.");
+		}
 
 		ind = 0;
 		uint8_t send_buffer[50];
diff --git a/hwconf/Ubox/100v/hw_ubox_100_core.c b/hwconf/Ubox/100v/hw_ubox_100_core.c
index a87744a6fc..30ab8d6e95 100755
--- a/hwconf/Ubox/100v/hw_ubox_100_core.c
+++ b/hwconf/Ubox/100v/hw_ubox_100_core.c
@@ -336,6 +336,16 @@ static enPOWER_KEY_TYPE power_key_type = power_key_type_undecided;
 static uint32_t power_key_pressed_ms = 0;
 static bool power_key_pressed_when_power_on = false;
 
+bool hw_reject_flash_loading(void)
+{
+	bool do_reject = power_key_type == power_key_type_momentary;
+	if (do_reject)
+		commands_printf("%s: Momentary button detected, firmware loading is not permitted!", HW_NAME);
+
+	// Don't allow loading firmware if the power button behaves like a momentary one
+	return do_reject;
+}
+
 static THD_FUNCTION(shutdown_thread, arg) {
 	(void)arg;
 	chRegSetThreadName("Shutdown_ubox");
diff --git a/hwconf/Ubox/100v/hw_ubox_100_core.h b/hwconf/Ubox/100v/hw_ubox_100_core.h
index 9cd2886552..3658c74a89 100755
--- a/hwconf/Ubox/100v/hw_ubox_100_core.h
+++ b/hwconf/Ubox/100v/hw_ubox_100_core.h
@@ -36,6 +36,8 @@
 #error "Must define hardware type"
 #endif
 
+#define REJECT_FLASH_LOADING hw_reject_flash_loading()
+
 // HW properties
 #define HW_HAS_3_SHUNTS
 #define INVERTED_SHUNT_POLARITY
@@ -295,5 +297,6 @@
 
 // HW-specific functions
 float hw100_250_get_temp(void);
+bool hw_reject_flash_loading(void);
 
 #endif /* HW_UBOX_V2_100_CORE_H_ */
diff --git a/hwconf/Ubox/126v/hw_ubox_126_core.c b/hwconf/Ubox/126v/hw_ubox_126_core.c
index 82801b21a3..22da4349f0 100644
--- a/hwconf/Ubox/126v/hw_ubox_126_core.c
+++ b/hwconf/Ubox/126v/hw_ubox_126_core.c
@@ -336,6 +336,16 @@ static enPOWER_KEY_TYPE power_key_type = power_key_type_undecided;
 static uint32_t power_key_pressed_ms = 0;
 static bool power_key_pressed_when_power_on = false;
 
+bool hw_reject_flash_loading(void)
+{
+	bool do_reject = power_key_type == power_key_type_momentary;
+	if (do_reject)
+		commands_printf("%s: Momentary button detected, firmware loading is not permitted!", HW_NAME);
+
+	// Don't allow loading firmware if the power button behaves like a momentary one
+	return do_reject;
+}
+
 static THD_FUNCTION(shutdown_thread, arg) {
 	(void)arg;
 	chRegSetThreadName("Shutdown_ubox");
diff --git a/hwconf/Ubox/126v/hw_ubox_126_core.h b/hwconf/Ubox/126v/hw_ubox_126_core.h
index 87c3864f1e..f7d7534c67 100644
--- a/hwconf/Ubox/126v/hw_ubox_126_core.h
+++ b/hwconf/Ubox/126v/hw_ubox_126_core.h
@@ -32,6 +32,8 @@
 #error "Must define hardware type"
 #endif
 
+#define REJECT_FLASH_LOADING hw_reject_flash_loading()
+
 // HW properties
 #define HW_HAS_3_SHUNTS
 #define INVERTED_SHUNT_POLARITY
@@ -280,5 +282,6 @@
 
 // HW-specific functions
 float hw100_250_get_temp(void);
+bool hw_reject_flash_loading(void);
 
 #endif /* HW_UBOX_126_CORE_H_ */
diff --git a/hwconf/hw.h b/hwconf/hw.h
index e69b9e2ac0..a9a01fc58e 100644
--- a/hwconf/hw.h
+++ b/hwconf/hw.h
@@ -547,6 +547,10 @@
 #define HW_PERMANENT_NRF_FAILED_HOOK()
 #endif
 
+#ifndef REJECT_FLASH_LOADING
+#define REJECT_FLASH_LOADING false
+#endif
+
 #ifndef HW_EARLY_INIT
 #define HW_EARLY_INIT()
 #endif