diff --git a/STM32F103_App1/HardWare/SYSINIT/app_loop.c b/STM32F103_App1/HardWare/SYSINIT/app_loop.c
index 784fb9e..2281618 100644
--- a/STM32F103_App1/HardWare/SYSINIT/app_loop.c
+++ b/STM32F103_App1/HardWare/SYSINIT/app_loop.c
@@ -59,7 +59,7 @@ void storage_unlock(void)
 }
 
 /*==== 业务模块初始化（调度器启动前调用，与裸机版一致）====*/
-static volatile uint8_t s_qr_showing = 0;   /* 开机二维码页显示中: 抑制预调度周期刷新 */
+static volatile uint8_t s_oled_boot_page = 0;   /* 开机页(二维码/联网选择)显示中: 抑制预调度周期刷新防覆盖 */
 
 /*==== 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;
@@ -98,6 +98,14 @@ static uint8_t net_mode_select(void)
     oled_locate(1, 0); oled_print("1:4G 2:WiFi热点");
     oled_locate(2, 0); oled_print("3:智能配网");
 
+    s_oled_boot_page = 1;   /* 抑制预调度周期刷新, 防止联网进度页覆盖本页 */
+
+    /* 第 3 行: 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) */
+    char label[24];
+    snprintf(label, sizeof(label), "上次:%s", names[mode]);
+    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;
@@ -106,10 +114,12 @@ static uint8_t net_mode_select(void)
         int remain = (int)(10000u - elapsed) / 1000;
         if (remain < 0) remain = 0;
         if (remain != last_sec) {
-            char buf[24];
+            char num[6];
             last_sec = remain;
-            snprintf(buf, sizeof(buf), "上次:%s %2ds", names[mode], remain);
-            oled_locate(3, 0); oled_print_line(buf);
+            snprintf(num, sizeof(num), " %2ds", remain);
+            oled_locate(3, num_col8);
+            oled_print(num);
+            oled_print("    ");   /* 清掉长尾 */
         }
         key = key_scan_once();
         if (key) break;
@@ -128,6 +138,7 @@ static uint8_t net_mode_select(void)
     oled_print((char *)names[mode]);
     bg_delay(800);
     oled_clear();
+    s_oled_boot_page = 0;
     return mode;
 }
 
@@ -182,11 +193,11 @@ void app_init(void)
     oled_init();
     if (g_mqtt_configured) {
         /* 开机显示设备 ID 二维码 10s(内容=ClientID, 右侧附 ID 文本), 便于现场扫码绑定 */
-        s_qr_showing = 1;
+        s_oled_boot_page = 1;
         oled_show_qrcode(MqttInfoStr.ClientID);
         log_info("> OLED: 开机显示设备ID二维码 10s");
         bg_delay(1000);
-        s_qr_showing = 0;
+        s_oled_boot_page = 0;
         oled_clear();
     }
     if (g_feed_scale_on) { oled_locate(1, 1); oled_print("智能水产投料机"); }
@@ -339,7 +350,7 @@ static void oled_home_refresh(uint32_t up_ms);
 void app_oled_presched_tick(void)
 {
     static uint32_t last = 0;
-    if (s_qr_showing) return;
+    if (s_oled_boot_page) return;
     if (HAL_GetTick() - last < 500) return;
     last = HAL_GetTick();
     oled_home_refresh(0);