diff --git a/V1.5/STM32F103_App1/HardWare/CAR/air780e.c b/V1.5/STM32F103_App1/HardWare/CAR/air780e.c
index 9556486..9f315ca 100644
--- a/V1.5/STM32F103_App1/HardWare/CAR/air780e.c
+++ b/V1.5/STM32F103_App1/HardWare/CAR/air780e.c
@@ -583,6 +583,11 @@ static void air780e_trigger_ota_body(const char *host, int port, const char *pat
     if(r==0)return;
     if(air780e_send_at("AT+CSQ","OK",3000)!=0)return;
 
+    /* 模组 OTA 入口刚复位过，必须先等网络重新附着(CATT=1)再激活承载，
+     * 否则注册慢(弱信号/物联卡)时 SAPBR=1,1 必失败(S3) */
+    log_info("> OTA: 等待网络附着...");
+    if (cat_wait_cgatt_attached(30) != 0) { log_warn("> OTA: 附着超时"); return; }
+
     log_info("> SAPBR...");
     if(air780e_send_at("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"","OK",3000)!=0){log_info("> S1");return;}
     if(air780e_send_at("AT+SAPBR=3,1,\"APN\",\"\"","OK",3000)!=0){log_info("> S2");return;}
diff --git a/V1.5/鐗堟湰璇存槑.md b/V1.5/鐗堟湰璇存槑.md
index 5bb0c52..75b7d03 100644
--- a/V1.5/鐗堟湰璇存槑.md
+++ b/V1.5/鐗堟湰璇存槑.md
@@ -145,3 +145,5 @@
 - 淇 4G OTA 澶辫触鍚�"鍋囨"锛堝钩鍙颁笉鍙帶/鏃犳硶鍐� OTA锛夛細OTA 鍏ュ彛浼氬浣� 4G 妯＄粍锛孧QTT 宸叉柇浣�
   ready 鏍囧織鏈竻锛孲1~S4 绛夊墠缃け璐ラ��鍑哄悗璁惧鍋囧湪绾裤�傜幇鏀逛负浠讳綍 OTA 澶辫触璺緞閫�鍑哄悗
   鏍囪鍘熷洜(RSN_OTA_FAIL "OTA澶辫触涓")骞朵富鍔ㄥ浣嶏紝閲嶅惎璧板共鍑� 4G 鍒濆鍖栨仮澶嶈仈缃�
+- 淇 OTA 鐨� SAPBR 婵�娲绘壙杞芥鐜囨�уけ璐ワ細OTA 鍏ュ彛澶嶄綅妯＄粍鍚庢湭绛夌綉缁滈噸鏂伴檮鐫�(CATT)灏�
+  婵�娲绘壙杞斤紝娉ㄥ唽鎱㈡椂蹇呭け璐ャ�傜幇 CSQ 鍚庡姞 cat_wait_cgatt_attached(30)锛岄檮鐫�鎴愬姛鎵嶈蛋 SAPBR