diff --git a/STM32F103_App1/HardWare/SYSINIT/app_loop.c b/STM32F103_App1/HardWare/SYSINIT/app_loop.c
index 6377c9d..ce5ce4b 100644
--- a/STM32F103_App1/HardWare/SYSINIT/app_loop.c
+++ b/STM32F103_App1/HardWare/SYSINIT/app_loop.c
@@ -63,7 +63,8 @@ static volatile uint8_t s_oled_boot_page = 0;   /* 
 
 /*==== 开机联网方式选择(V1.7.1 新板按键): 10s 倒计时 ====
  * KEY1(PC6)=4G  KEY2(PC7)=WiFi固定热点  KEY3(PB14)=SmartConfig 配网, 低电平=按下;
- * 超时未按 = EEPROM 记忆的上次选择(首次默认 4G); 选择变化才写 EEPROM(偏移130);
+ * 倒计时内按不同键=切换选中项(可反复改), 重复按当前项=立即确认, 超时=当前选中项生效;
+ * 初始选中项 = EEPROM 记忆的上次选择(首次默认 4G); 变化才写 EEPROM(偏移130);
  * 选定后不再自动切换通道, 连不上原地重试 */
 
 /* 按键扫描: 返回 0=无 1~3=键号; 连续 2 次(约100ms)确认消抖 */
@@ -102,13 +103,12 @@ static uint8_t net_mode_select(void)
 
     /* 第 3 行: 模式名从最左起 + 秒数紧随其后(不带"上次"前缀, 长模式名才放得下);
      * 标签只写一次, 之后每秒仅更新秒数(整行重写要读字库 IC, 会闪) */
-    const char *label = names[mode];
+    const char *label = names[mode];   /* 选中项, 按键切换时跟随更新 */
     oled_locate(3, 0); oled_print_line(label);
     uint8_t num_col8 = (uint8_t)((oled_text_w(label) + 7) / 8);
 
     uint32_t start = HAL_GetTick();
     int last_sec = -1;
-    int key = 0;
     for (;;) {
         uint32_t elapsed = HAL_GetTick() - start;
         int remain = (int)(10000u - elapsed) / 1000;
@@ -121,19 +121,25 @@ static uint8_t net_mode_select(void)
             oled_print(num);
             oled_print("    ");   /* 清掉长尾 */
         }
-        key = key_scan_once();
-        if (key) break;
+        int key = key_scan_once();
+        if (key) {
+            uint8_t cand = (uint8_t)(key - 1);   /* 键1->0(4G) 键2->1(WiFi固定) 键3->2(配网) */
+            if (cand == mode) break;             /* 重复按当前项 = 立即确认 */
+            mode = cand;                         /* 切换选中项, 倒计时继续 */
+            log_info("> NET: 联网方式切换为 %s", names[mode]);
+            label = names[mode];
+            oled_locate(3, 0); oled_print_line(label);   /* 换模式才重写整行 */
+            num_col8 = (uint8_t)((oled_text_w(label) + 7) / 8);
+            last_sec = -1;                       /* 强制立即刷新秒数 */
+        }
         if (elapsed >= 10000u) break;
         bg_delay(50);
     }
 
-    if (key) {
-        mode = (uint8_t)(key - 1);   /* 键1->0(4G) 键2->1(WiFi固定) 键3->2(配网) */
-        if (mode != saved) {
-            eepromWriteData(EEPROM_NETMODE_ADDR, &mode, 1);   /* 记忆本次选择 */
-        }
+    if (mode != saved) {
+        eepromWriteData(EEPROM_NETMODE_ADDR, &mode, 1);   /* 记忆本次选择 */
     }
-    log_info("> NET: 联网方式选择: %s (%s)", names[mode], key ? "按键选定" : "超时默认");
+    log_info("> NET: 联网方式确定: %s", names[mode]);
     oled_locate(3, 0); oled_print_line("已选:");
     oled_print((char *)names[mode]);
     bg_delay(800);
diff --git a/鐗堟湰璇存槑.md b/鐗堟湰璇存槑.md
index 2a29bd4..784f72f 100644
--- a/鐗堟湰璇存槑.md
+++ b/鐗堟湰璇存槑.md
@@ -22,7 +22,8 @@
   鍛戒护閾捐矾鏈�缁堟棤搴旂瓟鍗冲垽绂荤嚎骞跺簲绛斿钩鍙� `ext relay board offline`锛屼笅娆″懡浠よ嚜鍔ㄩ噸鏂版帰娴嬫仮澶嶏紱
   鏂數鎭㈠瑙﹀彂鐐逛笉鍙橈紙绂荤嚎鈫掍笂绾挎瘮瀵� EEPROM 閫愯矾琛ュ彂锛�
 - **鑱旂綉鏂瑰紡鏀逛负寮�鏈烘寜閿墜鍔ㄩ�夋嫨**锛堝簾闄よ嚜鍔ㄥ垏鎹級锛氭杩庨〉鍚� 10s 鍊掕鏃讹紝KEY1(PC6)=4G /
-  KEY2(PC7)=WiFi 鍥哄畾鐑偣 / KEY3(PB14)=SmartConfig 閰嶇綉锛涜秴鏃舵湭鎸� = EEPROM 璁板繂鐨勪笂娆￠�夋嫨锛堥娆￠粯璁� 4G锛夛紱
+  KEY2(PC7)=WiFi 鍥哄畾鐑偣 / KEY3(PB14)=SmartConfig 閰嶇綉锛涘�掕鏃跺唴鎸変笉鍚岄敭**鍙弽澶嶅垏鎹㈤�変腑椤�**锛�
+  **閲嶅鎸夊綋鍓嶉」=绔嬪嵆纭**锛岃秴鏃�=褰撳墠閫変腑椤圭敓鏁堬紱鍒濆閫変腑椤�=EEPROM 璁板繂鐨勪笂娆￠�夋嫨锛堥娆￠粯璁� 4G锛夛紱
   閫夋嫨鍙樺寲鎵嶅啓 EEPROM锛堝亸绉� 130锛屽鐢ㄥ師鑱旂綉鏂瑰紡璁板繂瀛楄妭锛夛紱**閫夊畾鍚庨攣瀹氶�氶亾锛岃繛涓嶄笂鍘熷湴閲嶈瘯锛�
   涓嶅啀 4G鈫擶iFi 鑷姩鍥為��**锛�4G 鏃犲崱/鏃犱俊鍙枫�乄iFi 杩炰笉涓婂潎涓烘瘡 10s 閲嶈瘯锛夛紱
   WiFi 渚ф寜妯″紡闄愬埗杩炴帴鏂瑰紡锛氬浐瀹氭ā寮忓彧杩炲浐瀹氱儹鐐癸紝閰嶇綉妯″紡鍙蛋宸插瓨 AP+SmartConfig锛�