diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
index dabf066..3836733 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
@@ -776,10 +776,6 @@ void iot_mqtt_publish_sensor(void) {
         }
     }
 
-    /* 快照落盘: 主循环上下文 (Step1 直读帧 + 回调帧都已在 ingest 入队);
-       放在 READY/enable 检查之前 → 断网/未使能期间照常落 (脱机取证语义) */
-    snap_flush();
-
     /*--- 事件上报状态机: 发送/重发/重连补报 ---*/
     iot_evt_process();
 
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
index 3be6451..2a8135c 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
@@ -268,6 +268,7 @@ void Main_Circulation(void)
         }
 
         uart_srv();
+        snap_flush();   /* 快照落盘: 无条件挂主循环 (原在 iot_enable 分支, TCP 模式不落盘) */
 
         poll_dbn_ble();
 
@@ -300,12 +301,18 @@ int main(void)
     // USART_Printf_Init( 115200 );
     USART_Printf_Init( 256000 );
 #endif
+    /* 诊断: 复位原因寄存器 (bit31=IWDG bit30=WWDG bit29=LPWR bit26=NRST bit25=POR bit24=软复位)
+       每次上电必打, 区分看门狗死锁 vs 掉电 vs 外部复位 */
+    PRINT("RST_REASON: 0x%08lx\n", (unsigned long)OFFLOG_RCC_RSTSCKR);
     PRINT("%s\n", VER_LIB);
     PRINT("SystemCoreClock:%d\n", SystemCoreClock);
     GetMacAddr(gMacAddr);
     storage_init();
+    PRINT("INIT: storage ok\n");
     offlog_init();
+    PRINT("INIT: offlog ok\n");
     snap_init();
+    PRINT("INIT: snap ok\n");
 
     /* 复位原因: 必须在初始化后立即读 (离复位时刻最近), 并清除标志,
        保证下次上电只反映本次复位原因 (RCC_RSTSCKR, STM32F1/CH32V20x 兼容) */