diff --git a/source/daplink/drag-n-drop/flash_intf.h b/source/daplink/drag-n-drop/flash_intf.h
index bdb16307b..3c92f5fc6 100644
--- a/source/daplink/drag-n-drop/flash_intf.h
+++ b/source/daplink/drag-n-drop/flash_intf.h
@@ -37,6 +37,7 @@ typedef error_t (*flash_intf_erase_sector_cb_t)(uint32_t sector);
 typedef error_t (*flash_intf_erase_chip_cb_t)(void);
 typedef uint32_t (*flash_program_page_min_size_cb_t)(uint32_t addr);
 typedef uint32_t (*flash_erase_sector_size_cb_t)(uint32_t addr);
+typedef uint8_t (*flash_busy_cb_t)(void);
 
 typedef struct {
     flash_intf_init_cb_t init;
@@ -46,6 +47,7 @@ typedef struct {
     flash_intf_erase_chip_cb_t erase_chip;
     flash_program_page_min_size_cb_t program_page_min_size;
     flash_erase_sector_size_cb_t erase_sector_size;
+    flash_busy_cb_t flash_busy;
 } flash_intf_t;
 
 // All flash interfaces.  Unsupported interfaces are NULL.
diff --git a/source/daplink/drag-n-drop/flash_manager.c b/source/daplink/drag-n-drop/flash_manager.c
index 31a4e0e4a..a453bd73d 100755
--- a/source/daplink/drag-n-drop/flash_manager.c
+++ b/source/daplink/drag-n-drop/flash_manager.c
@@ -276,6 +276,10 @@ static bool flash_intf_valid(const flash_intf_t *flash_intf)
     if (0 == flash_intf->erase_sector_size) {
         return false;
     }
+    
+    if (0 == flash_intf->flash_busy) {
+        return false;
+    }
 
     return true;
 }
diff --git a/source/daplink/drag-n-drop/iap_flash_intf.c b/source/daplink/drag-n-drop/iap_flash_intf.c
index ea56644e4..22612ce29 100644
--- a/source/daplink/drag-n-drop/iap_flash_intf.c
+++ b/source/daplink/drag-n-drop/iap_flash_intf.c
@@ -63,6 +63,7 @@ static bool sector_erase_allowed(uint32_t addr);
 static error_t intercept_page_write(uint32_t addr, const uint8_t *buf, uint32_t size);
 static error_t intercept_sector_erase(uint32_t addr);
 static error_t critical_erase_and_program(uint32_t addr, const uint8_t *data, uint32_t size);
+static uint8_t target_flash_busy(void);
 
 static const flash_intf_t flash_intf = {
     init,
@@ -72,6 +73,7 @@ static const flash_intf_t flash_intf = {
     erase_chip,
     program_page_min_size,
     erase_sector_size,
+    target_flash_busy,
 };
 
 const flash_intf_t *const flash_intf_iap_protected = &flash_intf;
@@ -497,3 +499,7 @@ static error_t critical_erase_and_program(uint32_t addr, const uint8_t *data, ui
 
     return ERROR_SUCCESS;
 }
+
+static uint8_t target_flash_busy(void){
+    return (state == STATE_OPEN);
+}
diff --git a/source/daplink/interface/main.c b/source/daplink/interface/main.c
index 569897039..94cf8f385 100644
--- a/source/daplink/interface/main.c
+++ b/source/daplink/interface/main.c
@@ -41,6 +41,7 @@
 #include "bootloader.h"
 #include "cortex_m.h"
 #include "sdk.h"
+#include "flash_intf.h"
 
 // Event flags for main task
 // Timers events
@@ -328,7 +329,7 @@ __task void main_task(void)
         if (flags & FLAGS_MAIN_30MS) {
 
             // handle reset button without eventing
-            if (!reset_pressed && gpio_get_reset_btn_fwrd()) {
+            if (!reset_pressed && gpio_get_reset_btn_fwrd() && !flash_intf_target->flash_busy()) { //added checking if flashing on target is in progress
                 // Reset button pressed
                 target_set_state(RESET_HOLD);
                 reset_pressed = 1;
diff --git a/source/daplink/interface/target_flash.c b/source/daplink/interface/target_flash.c
index 71b4a93fc..28d878642 100644
--- a/source/daplink/interface/target_flash.c
+++ b/source/daplink/interface/target_flash.c
@@ -32,6 +32,12 @@
 #include "util.h"
 #include "settings.h"
 
+typedef enum {
+    STATE_CLOSED,
+    STATE_OPEN,
+    STATE_ERROR
+} state_t;
+
 static error_t target_flash_init(void);
 static error_t target_flash_uninit(void);
 static error_t target_flash_program_page(uint32_t adr, const uint8_t *buf, uint32_t size);
@@ -39,6 +45,7 @@ static error_t target_flash_erase_sector(uint32_t addr);
 static error_t target_flash_erase_chip(void);
 static uint32_t target_flash_program_page_min_size(uint32_t addr);
 static uint32_t target_flash_erase_sector_size(uint32_t addr);
+static uint8_t target_flash_busy(void);
 
 static const flash_intf_t flash_intf = {
     target_flash_init,
@@ -48,8 +55,11 @@ static const flash_intf_t flash_intf = {
     target_flash_erase_chip,
     target_flash_program_page_min_size,
     target_flash_erase_sector_size,
+    target_flash_busy,
 };
 
+static state_t state = STATE_CLOSED;
+
 const flash_intf_t *const flash_intf_target = &flash_intf;
 
 static error_t target_flash_init()
@@ -68,7 +78,7 @@ static error_t target_flash_init()
     if (0 == swd_flash_syscall_exec(&flash->sys_call_s, flash->init, target_device.flash_start, 0, 0, 0)) {
         return ERROR_INIT;
     }
-
+    state = STATE_OPEN;
     return ERROR_SUCCESS;
 }
 
@@ -84,6 +94,7 @@ static error_t target_flash_uninit(void)
     // Check to see if anything needs to be done after programming.
     // This is usually a no-op for most targets.
     target_set_state(POST_FLASH_RESET);
+    state = STATE_CLOSED;
     swd_off();
     return ERROR_SUCCESS;
 }
@@ -207,3 +218,7 @@ static uint32_t target_flash_erase_sector_size(uint32_t addr)
     }
     return target_device.sector_size;
 }
+
+static uint8_t target_flash_busy(void){
+    return (state == STATE_OPEN);
+}
diff --git a/source/daplink/usb2uart/usbd_user_cdc_acm.c b/source/daplink/usb2uart/usbd_user_cdc_acm.c
index fd6f5443f..b5580b02a 100644
--- a/source/daplink/usb2uart/usbd_user_cdc_acm.c
+++ b/source/daplink/usb2uart/usbd_user_cdc_acm.c
@@ -24,6 +24,7 @@
 #include "main.h"
 #include "target_reset.h"
 #include "uart.h"
+#include "flash_intf.h"
 
 UART_Configuration UART_Config;
 
@@ -111,22 +112,22 @@ static U32 start_break_time = 0;
 int32_t USBD_CDC_ACM_SendBreak(uint16_t dur)
 {
     uint32_t end_break_time;
-
-    // reset and send the unique id over CDC
-    if (dur != 0) {
-        start_break_time = os_time_get();
-        target_set_state(RESET_HOLD);
-    } else {
-        end_break_time = os_time_get();
-
-        // long reset -> send uID over serial (300 -> break > 3s)
-        if ((end_break_time - start_break_time) >= (300)) {
-            main_reset_target(1);
+    if (!flash_intf_target->flash_busy()) { //added checking if flashing on target is in progress
+        // reset and send the unique id over CDC
+        if (dur != 0) {
+            start_break_time = os_time_get();
+            target_set_state(RESET_HOLD);
         } else {
-            main_reset_target(0);
+            end_break_time = os_time_get();
+
+            // long reset -> send uID over serial (300 -> break > 3s)
+            if ((end_break_time - start_break_time) >= (300)) {
+                main_reset_target(1);
+            } else {
+                main_reset_target(0);
+            }
         }
     }
-
     return (1);
 }