diff --git a/pc_firm/ble_security/ble_quick_security.c b/pc_firm/ble_security/ble_quick_security.c
index aef3bd7..5441a43 100644
--- a/pc_firm/ble_security/ble_quick_security.c
+++ b/pc_firm/ble_security/ble_quick_security.c
@@ -97,9 +97,8 @@ void ble_security_quick_pm_handler(pm_evt_t const *p_evt)
     
     // Call standard handlers (required)
     pm_handler_on_pm_evt(p_evt);
-    pm_handler_disconnect_on_sec_failure(p_evt);
     pm_handler_flash_clean(p_evt);
-    
+
     // Handle events
     switch (p_evt->evt_id) {
         case PM_EVT_CONN_SEC_SUCCEEDED:
@@ -109,17 +108,26 @@ void ble_security_quick_pm_handler(pm_evt_t const *p_evt)
                 DBG_PRINTF("PROD: Link secured (bonded)\r\n");
             }
             break;
-            
+
         case PM_EVT_CONN_SEC_FAILED:
-            DBG_PRINTF("Security failed: error=%d\r\n", 
+            DBG_PRINTF("Security failed: error=%d\r\n",
                       p_evt->params.conn_sec_failed.error);
-            
-            // Auto-retry if key missing
+
             if (p_evt->params.conn_sec_failed.error == PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING) {
+                // Key missing: 재페어링 시도, 실패 시 disconnect로 폴백
                 err_code = pm_conn_secure(p_evt->conn_handle, true);
-                if (err_code != NRF_ERROR_INVALID_STATE) {
+                if (err_code != NRF_ERROR_INVALID_STATE &&
+                    err_code != NRF_ERROR_BUSY &&
+                    err_code != BLE_ERROR_INVALID_CONN_HANDLE) {
                     APP_ERROR_CHECK(err_code);
                 }
+                if (err_code != NRF_SUCCESS) {
+                    // 재페어링 불가 → disconnect
+                    pm_handler_disconnect_on_sec_failure(p_evt);
+                }
+            } else {
+                // 기타 보안 실패 → disconnect
+                pm_handler_disconnect_on_sec_failure(p_evt);
             }
             break;
             
diff --git a/project/ble_peripheral/ble_app_bladder_patch/main.c b/project/ble_peripheral/ble_app_bladder_patch/main.c
index bba86d3..3b538f8 100644
--- a/project/ble_peripheral/ble_app_bladder_patch/main.c
+++ b/project/ble_peripheral/ble_app_bladder_patch/main.c
@@ -121,7 +121,7 @@
  * 빌드 설정
  * DEBUG_MINIMAL_BOOT 삭제 26.03.26 jhChun
  *============================================================================*/
-#define BLE_DEV_MODE        1   /* 1: 개발 모드 (보안 없음), 0: 양산 모드 (패스키 필수) */
+#define BLE_DEV_MODE        0   /* 1: 개발 모드 (보안 없음), 0: 양산 모드 (패스키 필수) */
 
 /*==============================================================================
  * 하드웨어 핀 정의
@@ -890,10 +890,7 @@ static void pm_evt_handler(pm_evt_t const * p_evt)
     uint32_t return_code;
     ret_code_t err_code;
 
-    /* SDK 기본 핸들러 체인 호출 */
-    pm_handler_on_pm_evt(p_evt);
-    pm_handler_disconnect_on_sec_failure(p_evt);
-    pm_handler_flash_clean(p_evt);
+    /* SDK 기본 핸들러 + 보안 처리 (ble_quick_security 내부에서 SDK 핸들러 호출) */
     ble_security_quick_pm_handler(p_evt);
 
     switch (p_evt->evt_id)
@@ -924,21 +921,14 @@ static void pm_evt_handler(pm_evt_t const * p_evt)
         }
         break;
 
-        /* 보안 연결 실패 → PIN/키 누락 시 강제 재페어링 시도 */
+        /* 보안 연결 실패 (retry/disconnect는 ble_quick_security에서 처리) */
         case PM_EVT_CONN_SEC_FAILED:
             DBG_PRINTF("[PM] Sec failed\r\n");
-            if (p_evt->params.conn_sec_failed.error == PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING)
-            {
-                err_code = pm_conn_secure(p_evt->conn_handle, true);
-                if (err_code != NRF_ERROR_INVALID_STATE)
-                {
-                    APP_ERROR_CHECK(err_code);
-                }
-            }
             break;
 
         /* 모든 본딩 삭제 완료 → 광고 재시작 */
         case PM_EVT_PEERS_DELETE_SUCCEEDED:
+            DBG_PRINTF("[PM] Bonds erased\r\n");
             advertising_start(false);
             break;