diff --git a/project/ble_peripheral/ble_app_bladder_patch/main.c b/project/ble_peripheral/ble_app_bladder_patch/main.c
index 7fbcb21..82360e3 100644
--- a/project/ble_peripheral/ble_app_bladder_patch/main.c
+++ b/project/ble_peripheral/ble_app_bladder_patch/main.c
@@ -115,8 +115,6 @@
 #include "dr_piezo.h"           /* Piezo ultrasound driver */
 #include "led_control.h"        /* LED direct control driver */
 
-
-
 /*==============================================================================
  * Build Configuration
  *============================================================================*/
@@ -157,7 +155,6 @@
 #define POWER_ON_DELAY                  5           /* Power button polling interval (5ms) */
 #define POWER_OFF_DELAY                 3000        /* Power-off delay: 3s after LED indication */
 #define POWER_RESET_DELAY               2000        /* Reset delay: 2s */
-#define LED_NUM                         24          /* LED pin number */
 
 /*==============================================================================
  * BLE Instances (statically allocated via SoftDevice macros)
@@ -195,6 +192,9 @@ static char * roles_str[] = {"INVALID_ROLE", "CENTRAL", "PERIPHERAL"};
 
 bool power_off_duble_prohibit = false;        /* Power-off double prevention flag */
 
+/*==============================================================================
+ * Extern Variables and Functions
+ *============================================================================*/
 /* -- External module flags (defined in main_timer/power_control) -- */
 extern bool go_device_power_off;       /* Power-off request flag */
 extern bool go_sleep_mode_enter;       /* Sleep mode entry request flag */
@@ -206,6 +206,14 @@ extern bool info4;                     /* Device info transmission complete flag
 extern uint8_t add_cycle;              /* Additional measurement cycle counter */
 extern bool motion_raw_data_enabled;   /* Motion raw data streaming enabled */
 
+/* -- External module functions (used in DFU prepare / disconnect cleanup) -- */
+extern void maa_async_abort(void);
+extern bool maa_async_on_tx_ready(void);
+extern bool maa_async_is_busy(void);
+extern void dr_piezo_power_off(void);
+extern void battery_timer_stop(void);
+extern void main_timer_stop(void);
+
 uint16_t cnt_s;                                         /* Power button polling counter (5ms units, 150=0.75s) */
 char ble_tx_buffer[BLE_NUS_MAX_DATA_LEN] = {0};         /* BLE text transmission buffer */
 uint8_t ble_bin_buffer[BLE_NUS_MAX_DATA_LEN] = {0};     /* BLE binary response buffer */
@@ -492,7 +500,6 @@ static void ble_dfu_evt_handler(ble_dfu_buttonless_evt_type_t event)
             break;
         case BLE_DFU_EVT_RESPONSE_SEND_ERROR:
             DBG_PRINTF("[DFU] Error\r\n");
-            APP_ERROR_CHECK(false);
             break;
         default:
             break;
@@ -551,10 +558,6 @@ static void nrf_qwr_error_handler(uint32_t nrf_error)
     APP_ERROR_HANDLER(nrf_error);
 }
 
-/* Async MAA TX complete handler (forward declarations) */
-extern bool maa_async_on_tx_ready(void);
-extern bool maa_async_is_busy(void);
-extern void maa_async_abort(void);
 
 /* 2026-03-17: Prevent blocking in BLE callback -- buffer command for main loop processing */
 static volatile uint8_t  pending_cmd_buf[BLE_NUS_MAX_DATA_LEN] = {0};