diff --git a/apps/usr_le_code/usr_dengle_sched.c b/apps/usr_le_code/usr_dengle_sched.c
index 223b153..6907a96 100644
--- a/apps/usr_le_code/usr_dengle_sched.c
+++ b/apps/usr_le_code/usr_dengle_sched.c
@@ -501,7 +501,7 @@ Dengle_Ret_t dengle_sched_usb_set(const uint8_t *payload, uint16_t payload_len)
     if (!s_inited) {
         return DENGLE_ERR_NOT_INIT;
     }
-    if (!payload || payload_len < 9) {
+    if (!payload || payload_len < 1) {
         return DENGLE_ERR_PARAM;
     }
 
diff --git a/apps/usr_le_code/usr_le_recieve.c b/apps/usr_le_code/usr_le_recieve.c
index 7370e14..320d971 100644
--- a/apps/usr_le_code/usr_le_recieve.c
+++ b/apps/usr_le_code/usr_le_recieve.c
@@ -360,24 +360,12 @@ void usr_data_ana(bleproto_appdata_desc_t *desc)
             printf("E_BLEPROTO_SERVICE_ID_RUNCMD_V2 cmd=%d bytes_len=%d\n",
                    pkt->cmd, pkt->device_bytes_len);
 
-#if TCFG_USB_SLAVE_CDC_ENABLE
-            /* 透传 device bytes 到 USB CDC（串口助手可见） */
-            if (pkt->bytes_data && pkt->device_bytes_len > 0)
-            {
-                u32 wlen = cdc_write_data(0, (u8 *)pkt->bytes_data, pkt->device_bytes_len);
-                printf("cdc_write_data %u/%u\n", wlen, (u32)pkt->device_bytes_len);
-                if (wlen == 0)
-                {
-                    printf("cdc write fail: USB not ready(DTR) or CDC not started\n");
-                }
-            }
-            else
-            {
+            /* COM 打开→透传 CDC；COM 关闭→对指定 JB 命令本地自动应答回 BLE */
+            if (pkt->bytes_data && pkt->device_bytes_len > 0) {
+                usr_jb_on_runcmd_bytes(pkt->bytes_data, pkt->device_bytes_len);
+            } else {
                 printf("runcmd_v2 no bytes payload\n");
             }
-#else
-            printf("TCFG_USB_SLAVE_CDC_ENABLE not enable\n");
-#endif
             break;
         }
         default:
diff --git a/apps/usr_le_code/usr_usb_jb.c b/apps/usr_le_code/usr_usb_jb.c
index 43cce8a..7823f1f 100644
--- a/apps/usr_le_code/usr_usb_jb.c
+++ b/apps/usr_le_code/usr_usb_jb.c
@@ -90,6 +90,9 @@ static uint8_t s_ble_txbuf[USR_JB_BLE_TX_SZ];
 static uint8_t s_last_ble_msgid;  /* 最近一次 BLE RX 的 msgid */
 static uint8_t s_rsp_buf[JB_RSP_BUF_SZ];
 
+static uint8_t usr_jb_checksum(const uint8_t *frame, uint16_t total_len);
+static uint8_t usr_jb_need_com_offline_auto_ack(uint8_t cmd);
+
 void usr_ble_rx_msgid_save(uint8_t msgid)
 {
     s_last_ble_msgid = msgid & 0x0F;
@@ -126,6 +129,7 @@ static int usr_jb_map_ble_pkt(uint8_t jb_cmd, ble_proto_packet_t *pkt)
     case 0x04: /* CONTROL_ACK */
     case 0x06: /* READ_ACK */
     case 0x31: /* OTA_NOTIFY_ACK */
+    case 0x33: /* OTA_DATA_ACK */
     case 0x37: /* OTA_STOP_BLE_ACK */
         pkt->cmd = USR_JB_BLE_CMD_ACK;
         pkt->gateway_int_cnt = 2;
@@ -200,6 +204,46 @@ static void usr_jb_forward_to_ble(const uint8_t *frame, uint16_t len)
     }
 }
 
+/**
+ * @brief  是否属于 COM 离线时需本地自动应答的命令
+ */
+static uint8_t usr_jb_need_com_offline_auto_ack(uint8_t cmd)
+{
+    switch (cmd) {
+    case USR_JB_CMD_CTRL: /* 0x03 → ACK 0x04，映射表已支持 */
+    case USR_JB_CMD_READ: /* 0x05 → ACK 0x06，映射表已支持 */
+    case USR_JB_CMD_OTA_NOTIFY: /* 0x30 → ACK 0x31 */
+    case USR_JB_CMD_OTA_DATA: /* 0x32 → ACK 0x33 */
+    case USR_JB_CMD_OTA_STOP_BLE: /* 0x36 → ACK 0x37 */
+        return 1;
+    default:
+        return 0;
+    }
+}
+
+/**
+ * @brief  组简单 JB 应答帧（cmd+1 / 同 SN / result），再走 forward 发 BLE
+ */
+static void usr_jb_send_simple_ack_frame(uint8_t req_cmd, uint8_t sn, uint8_t result)
+{
+    uint8_t frame[8];
+    uint16_t len_field = 4; /* CMD+SN+result+CKSUM */
+    uint16_t total = len_field + 4;
+
+    frame[0] = PKT_HEAD_0;
+    frame[1] = PKT_HEAD_1;
+    frame[2] = (uint8_t)(len_field >> 8);
+    frame[3] = (uint8_t)(len_field & 0xFF);
+    frame[4] = (uint8_t)(req_cmd + 1);
+    frame[5] = sn;
+    frame[6] = result;
+    frame[7] = usr_jb_checksum(frame, total);
+
+    printf("usr_jb auto-ack req=0x%02x rsp=0x%02x sn=%u result=0x%02x\n",
+           req_cmd, frame[4], sn, result);
+    usr_jb_forward_to_ble(frame, total);
+}
+
 /*============================================================================*/
 /* 环形缓冲 / 校验                                                              */
 /*============================================================================*/
@@ -621,7 +665,21 @@ static void usr_jb_process_timeout(void *priv)
             break;
 
         default:
-            /* 其它命令：整帧透传到 BLE（按 JB cmd 映射 ble_proto cmd） */
+            /*
+             * COM 未打开：0x03/0x05 等需本地自动应答回 BLE；
+             * COM 已打开或其它命令：按原逻辑透传（由映射表决定能否发出）
+             */
+#if TCFG_USB_SLAVE_CDC_ENABLE
+            if (!cdc_is_com_open() && usr_jb_need_com_offline_auto_ack(cmd)) {
+                usr_jb_send_simple_ack_frame(cmd, sn, 0x00);
+                break;
+            }
+#else
+            if (usr_jb_need_com_offline_auto_ack(cmd)) {
+                usr_jb_send_simple_ack_frame(cmd, sn, 0x00);
+                break;
+            }
+#endif
             usr_jb_forward_to_ble(pkt, pkt_len);
             break;
         }
@@ -676,3 +734,25 @@ void usr_usb_jb_feed(uint8_t *buf, uint32_t len)
         s_process_timer = sys_timeout_add(NULL, usr_jb_process_timeout, 20);
     }
 }
+
+/**
+ * @brief  BLE RUNCMD_V2 bytes：COM 开则透传 CDC，关则走 feed 统一解析/自动应答
+ */
+void usr_jb_on_runcmd_bytes(const uint8_t *data, uint16_t len)
+{
+    if (!data || len == 0) {
+        return;
+    }
+
+#if TCFG_USB_SLAVE_CDC_ENABLE
+    if (cdc_is_com_open()) {
+        u32 wlen = cdc_write_data(0, (u8 *)data, len);
+        printf("usr_jb runcmd -> CDC %u/%u\n", wlen, (u32)len);
+        return;
+    }
+#endif
+
+    /* COM 未打开：与 USB 入环同一路径，由 process 里 get_one_packet + auto-ack 处理 */
+    printf("usr_jb runcmd COM closed, feed for local auto-ack len=%u\n", len);
+    usr_usb_jb_feed((uint8_t *)data, len);
+}
diff --git a/apps/usr_le_code/usr_usb_jb.h b/apps/usr_le_code/usr_usb_jb.h
index 4b1d195..7d67c23 100644
--- a/apps/usr_le_code/usr_usb_jb.h
+++ b/apps/usr_le_code/usr_usb_jb.h
@@ -25,6 +25,15 @@
 #define USR_JB_CMD_DENGLE_CLR     (0x72)   /**< USB 清除全部 Dengle；ACK=0x73 */
 #define USR_JB_CMD_DENGLE_QRY     (0x74)   /**< USB 查询 Dengle 配置；RSP=0x75 */
 
+/** COM 未打开时，BLE 下发需设备本地自动应答的 JB 命令 */
+#define USR_JB_CMD_CTRL           (0x03)   /**< → ACK 0x04 */
+#define USR_JB_CMD_READ           (0x05)   /**< → ACK 0x06 */
+
+/** OTA 相关命令 */
+#define USR_JB_CMD_OTA_NOTIFY (0x30) /**< → ACK 0x31 */
+#define USR_JB_CMD_OTA_DATA   (0x32) /**< → ACK 0x33 */
+#define USR_JB_CMD_OTA_STOP_BLE (0x36) /**< → ACK 0x37 */
+
 /*============================================================================*/
 /* 外部接口                                                                    */
 /*============================================================================*/
@@ -65,4 +74,14 @@ uint8_t usr_ble_rx_msgid_get(void);
  */
 void usr_usb_jb_feed(uint8_t *buf, uint32_t len);
 
+/**
+ * @brief  BLE RUNCMD_V2 下发的 JB 字节流处理
+ * @note   COM 已打开 → 透传 CDC 给上位机；
+ *         COM 未打开 → 调用 usr_usb_jb_feed，统一走 get_one_packet 解析后本地自动应答
+ * @param  data  bytes_data
+ * @param  len   长度
+ * @return void
+ */
+void usr_jb_on_runcmd_bytes(const uint8_t *data, uint16_t len);
+
 #endif /* __USR_USB_JB_H__ */