diff --git a/pc_firm/ble_security/ble_quick_security.c b/pc_firm/ble_security/ble_quick_security.c
index 5441a43..82f5fba 100644
--- a/pc_firm/ble_security/ble_quick_security.c
+++ b/pc_firm/ble_security/ble_quick_security.c
@@ -126,15 +126,23 @@ void ble_security_quick_pm_handler(pm_evt_t const *p_evt)
                     pm_handler_disconnect_on_sec_failure(p_evt);
                 }
             } else {
-                // 기타 보안 실패 → disconnect
-                pm_handler_disconnect_on_sec_failure(p_evt);
+                // 기타 보안 실패 → bond 삭제 후 재페어링 시도
+                pm_peer_id_t peer_id;
+                if (pm_peer_id_get(p_evt->conn_handle, &peer_id) == NRF_SUCCESS
+                    && peer_id != PM_PEER_ID_INVALID) {
+                    pm_peer_delete(peer_id);
+                }
+                err_code = pm_conn_secure(p_evt->conn_handle, true);
+                if (err_code != NRF_SUCCESS) {
+                    pm_handler_disconnect_on_sec_failure(p_evt);
+                }
             }
             break;
             
         case PM_EVT_CONN_SEC_CONFIG_REQ:
             {
                 pm_conn_sec_config_t config = {
-                    .allow_repairing = m_state.dev_mode
+                    .allow_repairing = true
                 };
                 pm_conn_sec_config_reply(p_evt->conn_handle, &config);
             }
diff --git a/project/ble_peripheral/ble_app_bladder_patch/main.c b/project/ble_peripheral/ble_app_bladder_patch/main.c
index 0c75a47..177e69e 100644
--- a/project/ble_peripheral/ble_app_bladder_patch/main.c
+++ b/project/ble_peripheral/ble_app_bladder_patch/main.c
@@ -944,19 +944,15 @@ static void pm_evt_handler(pm_evt_t const * p_evt)
             DBG_PRINTF("[PM] Sec failed\r\n");
             break;
 
-        /* 모든 본딩 삭제 완료 → 광고 재시작 */
+        /* 모든 본딩 삭제 완료 → 활성 연결이 없을 때만 광고 재시작 */
         case PM_EVT_PEERS_DELETE_SUCCEEDED:
             DBG_PRINTF("[PM] Bonds erased\r\n");
-            advertising_start(false);
+            if (m_conn_handle == BLE_CONN_HANDLE_INVALID) {
+                advertising_start(false);
+            }
             break;
 
-        /* 보안 설정 요청 → 재페어링 허용 */
-        case PM_EVT_CONN_SEC_CONFIG_REQ:
-        {
-            pm_conn_sec_config_t conn_sec_config = {.allow_repairing = true};
-            pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
-        }
-        break;
+        /* PM_EVT_CONN_SEC_CONFIG_REQ → ble_quick_security에서 처리 */
 
         /* 피어 데이터(본딩 정보) 갱신 성공 → 피어 BLE 주소 저장 */
         case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
@@ -1641,7 +1637,8 @@ static void main_s(void * p_context)
             battery_timer_start();
 
 #if FEATURE_SECURE_CONNECTION
-            advertising_start(erase_bonds || bond_data_delete);
+            /* DEV 모드: ble_security_quick_init()에서 이미 bond 삭제됨 → 중복 방지 */
+            advertising_start(!ble_security_is_dev_mode() && (erase_bonds || bond_data_delete));
 #else
             advertising_start();
 #endif