diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c
index ee17cdb..381711c 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c
@@ -874,8 +874,12 @@ static int format_loop_param_json(char *buf, uint16_t buf_size, const LUP_ParamG
 static void json_sensor_callback(const uint8_t *pkg, uint16_t len)
 {
     FAULT_MARKER(MK_EVT_CB_IN);
+    /* 2026-08-13 实验: enter PRINT 是 LUP 帧后卡死嫌疑点 (printf %d 处理死循环),
+       注释验证 — 若卡死消失则坐实 printf 问题, 再深挖 _write/锁 */
+#if 0
     PRINT("JSON: sensor_cb enter socket=%d auth=%d report=%d\n",
           g_json_socket_listen, g_json_auth_state, g_report_cfg.enable);
+#endif
 
     // Check: socket active, authed, report enabled
     if (g_json_socket_listen == 0xFF) { PRINT("JSON: sensor_cb skip: no socket\n"); return; }
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/usart_biz.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/usart_biz.c
index 8becf5b..aeed38e 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/usart_biz.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/usart_biz.c
@@ -183,11 +183,14 @@ void uart_srv(void)
                     }                    
                 }
 
-                // 调试打印
+                // 调试打印 (2026-08-13: LUP Rx 已在 lup_process_frame 缓冲打印,
+                // 此处重复逐字节打印冗余且高频 — 暂时关闭)
+#if 0
                 for(i = 0; i < g_pkg_uart_2.offset; i++){
                     PRINT(" %02X", g_pkg_uart_2.pkg[i]);
                 }
                 PRINT("\n");
+#endif
 
             }
             else {