diff --git a/AI项目上下文.md b/AI项目上下文.md
index 4164a27..6b66e29 100644
--- a/AI项目上下文.md
+++ b/AI项目上下文.md
@@ -108,7 +108,7 @@ SCALE/SCALE0/SCALE1（控制终端）/ GPS/GPS0/GPS1 / ENCLR（控制终端电
 ## 8. 网络层（network.c 抽象）
 
 - 4G（模组内置 MQTT，Air780 AT 指令）与 WiFi（ESP-01S TCP 透传+MCU 软件 MQTT 3.1.1）统一 NET_* 接口，共享 U2_CopyBuff 接收缓冲，net_at_mutex 互斥
-- 通道选择：EEPROM 记忆上次成功方式优先；4G 无 SIM/无信号重试 3 次回退 WiFi；WiFi 按 固定热点(40s) → SmartConfig(100s) 失败回 4G 循环
+- 通道选择（V1.7.1 起改为**开机按键手动选择**，仅控制终端新板）：欢迎页后 10s 倒计时，KEY1=4G/KEY2=WiFi固定/KEY3=配网，超时=EEPROM(130)记忆的上次选择（首次默认4G）；选定后锁定通道原地重试，**不再自动回退**；老版本（含采集终端）仍是 EEPROM 记忆优先+4G/WiFi 自动回退循环
 - **心跳阶梯**（防误复位）：30s PINGREQ，无应答立即 3s 快探测，连续 5 次（约42s）判死 → 先原 TCP 重发 CONNECT，失败再完整重建链路，**不整机复位**
 - ESP_EN 断电重启：esp_reset 先断电 500ms 再上电（治模块半死）；CWJAP 冷启动失败自动重试一次；连上后 AT+CWJAP? 打印信号强度%（含 busy 重试）
 - WiFi 就绪后 4G 断电省电（老板 CAT_PWR 置高；**控制终端新板 PC1 反相为拉低=掉电**）
diff --git a/STM32F103_App1/HardWare/NETWORK/net_wifi.c b/STM32F103_App1/HardWare/NETWORK/net_wifi.c
index be07dbb..e594ff5 100644
--- a/STM32F103_App1/HardWare/NETWORK/net_wifi.c
+++ b/STM32F103_App1/HardWare/NETWORK/net_wifi.c
@@ -54,22 +54,25 @@ int net_wifi_init(void)
     int joined = 0;
     uint8_t via_smart = 0;   /* 1=�����õ��������ȵ㣨�Ѵ�AP��SmartConfig�� */
 
-    /* �ϴ��������ȵ�ɹ��ģ�ģ������Ÿ��ȵ����룬���Ȳ��Զ����� */
-    if (NET_GetLastMode() == NET_MODE_WIFI_SMART) {
+    /* ����ѡ��ģʽ�������ӷ�ʽ(V1.7.1 ��): ����ģʽֻ���Ѵ�AP+SmartConfig, �̶�ģʽֻ���̶��ȵ� */
+    uint8_t fmode = NET_GetForceMode();
+
+    /* ����ģʽ��ģ��������ϴ������ȵ����룬���Ȳ��Զ����� */
+    if (fmode == NET_MODE_WIFI_SMART) {
         if (esp_saved_ap_connected(10) == 0) {
             joined = 1;
             via_smart = 1;
         }
     }
 
-    /* ��������̶��� SSID/PASS */
-    if (!joined && esp_join_fixed_ap() == 0) {
+    /* �̶��ȵ�ģʽ����������̶�/EEPROM ���õ� SSID/PASS */
+    if (!joined && fmode == NET_MODE_WIFI_FIXED && esp_join_fixed_ap() == 0) {
         joined = 1;
         via_smart = 0;
     }
 
-    /* �̶��ȵ������ϣ��� SmartConfig ����������ESP-Touch APP �㲥���룩 */
-    if (!joined) {
+    /* ����ģʽ���Ѵ� AP ��������� SmartConfig ����������ESP-Touch APP �㲥���룩 */
+    if (!joined && fmode == NET_MODE_WIFI_SMART) {
         if (esp_smartconfig() == 0) {
             joined = 1;
             via_smart = 1;
diff --git a/STM32F103_App1/HardWare/NETWORK/network.c b/STM32F103_App1/HardWare/NETWORK/network.c
index 7bfea01..d6c774d 100644
--- a/STM32F103_App1/HardWare/NETWORK/network.c
+++ b/STM32F103_App1/HardWare/NETWORK/network.c
@@ -67,7 +67,6 @@ volatile int g_net_ui_countdown = 0;
 static net_backend_t s_backend = NET_BACKEND_4G;
 
 /* �ϴγɹ�������ʽ��EEPROM ƫ�� 130���Ӳ���ռ�õ� 126���ܿ��� */
-#define EEPROM_NETMODE_ADDR  130
 static uint8_t s_last_mode = NET_MODE_4G;
 
 /* �� SIM ���Զ��ٴκ��� WiFi */
@@ -123,6 +122,15 @@ uint8_t NET_GetLastMode(void)
 }
 
 /* ������ʽ���䣺����ʽ�仯ʱдһ�� EEPROM��"ֻ��һ��"�� */
+/* ��������ѡ����������ʽ(Ĭ�� 4G); ѡ��������ͨ��, ������ԭ�����Բ��л� */
+static uint8_t s_force_mode = NET_MODE_4G;
+void NET_SetForceMode(uint8_t mode)
+{
+    if (mode > NET_MODE_WIFI_SMART) mode = NET_MODE_4G;
+    s_force_mode = mode;
+}
+uint8_t NET_GetForceMode(void) { return s_force_mode; }
+
 void NET_SaveMode(uint8_t mode)
 {
     if (mode == s_last_mode || mode > NET_MODE_WIFI_SMART) return;
@@ -140,10 +148,8 @@ void NET_init(void)
     g_no_sim_detected = 0;
     g_no_signal_detected = 0;
 
-    /* �� EEPROM ������ϴγɹ�������ʽ���Ƿ�ֵ(�� EEPROM δ��ʼ���� 0xFF)�� 4G */
-    uint8_t m = NET_MODE_4G;
-    eepromReadData(EEPROM_NETMODE_ADDR, &m, 1);
-    if (m > NET_MODE_WIFI_SMART) m = NET_MODE_4G;
+    /* ������ʽ = ��������ѡ��(NET_SetForceMode), ���ٶ� EEPROM �ϴγɹ���ʽ */
+    uint8_t m = s_force_mode;
     s_last_mode = m;
 
     if (m == NET_MODE_4G) {
@@ -222,7 +228,7 @@ void NET_process(void)
                     if (!g_no_sim_detected && !g_no_signal_detected) {
                         log_info("> NET: 4G SIM��/�ź������������ѻָ�");
                         fail_count = 0;
-                    } else if (fail_count >= NET_NO_SIM_SWITCH_COUNT) {
+                    } else if (fail_count >= NET_NO_SIM_SWITCH_COUNT && s_force_mode != NET_MODE_4G) {
                         log_warn("> NET: 4G ���� %d ���Բ����ã����˵� WiFi",
                                  NET_NO_SIM_SWITCH_COUNT);
                         net_switch_to_wifi();
@@ -259,7 +265,7 @@ void NET_process(void)
                 net_at_unlock();
                 if (wifi_rc == 0) {
                     fail_count = 0;
-                } else if (fail_count >= NET_WIFI_FAIL_SWITCH_COUNT) {
+                } else if (fail_count >= NET_WIFI_FAIL_SWITCH_COUNT && s_force_mode == NET_MODE_4G) {
                     log_warn("> NET: WiFi ����ʧ�ܣ����˵� 4G");
                     net_switch_to_4g();
                     fail_count = 0;
diff --git a/STM32F103_App1/HardWare/NETWORK/network.h b/STM32F103_App1/HardWare/NETWORK/network.h
index ca3e9a7..6ecd306 100644
--- a/STM32F103_App1/HardWare/NETWORK/network.h
+++ b/STM32F103_App1/HardWare/NETWORK/network.h
@@ -21,7 +21,13 @@ extern volatile uint8_t g_no_signal_detected;   /* 4G 
 /*===== �ϴγɹ�������ʽ��EEPROM �־û�������ʽ�仯ʱдһ�Σ�=====*/
 #define NET_MODE_4G          0   /* 4G */
 #define NET_MODE_WIFI_FIXED  1   /* WiFi - ������̶����ȵ� */
-#define NET_MODE_WIFI_SMART  2   /* WiFi - SmartConfig �������ȵ� */
+#define NET_MODE_WIFI_SMART  2
+
+#define EEPROM_NETMODE_ADDR  130   /* EEPROM ������ʽ�ֽ�: ��Ϊ��������ѡ����ģʽ(V1.7.1 ��) */
+
+/* ��������ѡ����������ʽ: ѡ�������Զ��л�ͨ��, ������ԭ������ */
+void    NET_SetForceMode(uint8_t mode);
+uint8_t NET_GetForceMode(void);   /* WiFi - SmartConfig �������ȵ� */
 uint8_t NET_GetLastMode(void);   /* ����ǰ����ķ�ʽ */
 void    NET_SaveMode(uint8_t mode);  /* ��ʽ�仯ʱд EEPROM��δ�仯��ղ��� */
 
diff --git a/STM32F103_App1/HardWare/SYSINIT/app_loop.c b/STM32F103_App1/HardWare/SYSINIT/app_loop.c
index 4143921..784fb9e 100644
--- a/STM32F103_App1/HardWare/SYSINIT/app_loop.c
+++ b/STM32F103_App1/HardWare/SYSINIT/app_loop.c
@@ -61,6 +61,76 @@ void storage_unlock(void)
 /*==== ҵ��ģ���ʼ��������������ǰ���ã��������һ�£�====*/
 static volatile uint8_t s_qr_showing = 0;   /* ������ά��ҳ��ʾ��: ����Ԥ��������ˢ�� */
 
+/*==== ����������ʽѡ��(V1.7.1 �°尴��): 10s ����ʱ ====
+ * KEY1(PC6)=4G  KEY2(PC7)=WiFi�̶��ȵ�  KEY3(PB14)=SmartConfig ����, �͵�ƽ=����;
+ * ��ʱδ�� = EEPROM ������ϴ�ѡ��(�״�Ĭ�� 4G); ѡ��仯��д EEPROM(ƫ��130);
+ * ѡ�������Զ��л�ͨ��, ������ԭ������ */
+
+/* ����ɨ��: ���� 0=�� 1~3=����; ���� 2 ��(Լ100ms)ȷ������ */
+static int key_scan_once(void)
+{
+    static uint8_t last = 0, cnt = 0;
+    uint8_t cur = 0;
+    if (HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_6) == GPIO_PIN_RESET)       cur = 1;
+    else if (HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_7) == GPIO_PIN_RESET)  cur = 2;
+    else if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_14) == GPIO_PIN_RESET) cur = 3;
+    if (cur && cur == last) {
+        cnt++;
+        if (cnt >= 2) { cnt = 0; last = 0; return cur; }
+    } else {
+        cnt = 0;
+        last = cur;
+    }
+    return 0;
+}
+
+static uint8_t net_mode_select(void)
+{
+    uint8_t saved = NET_MODE_4G;
+    eepromReadData(EEPROM_NETMODE_ADDR, &saved, 1);
+    if (saved > NET_MODE_WIFI_SMART) saved = NET_MODE_4G;
+    uint8_t mode = saved;
+
+    static const char *const names[3] = { "4G", "WiFi�ȵ�", "��������" };
+
+    oled_clear();
+    oled_locate(0, 1); oled_print("ѡ��������ʽ");
+    oled_locate(1, 0); oled_print("1:4G 2:WiFi�ȵ�");
+    oled_locate(2, 0); oled_print("3:��������");
+
+    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;
+        if (remain < 0) remain = 0;
+        if (remain != last_sec) {
+            char buf[24];
+            last_sec = remain;
+            snprintf(buf, sizeof(buf), "�ϴ�:%s %2ds", names[mode], remain);
+            oled_locate(3, 0); oled_print_line(buf);
+        }
+        key = key_scan_once();
+        if (key) break;
+        if (elapsed >= 10000u) break;
+        bg_delay(50);
+    }
+
+    if (key) {
+        mode = (uint8_t)(key - 1);   /* ��1->0(4G) ��2->1(WiFi�̶�) ��3->2(����) */
+        if (mode != saved) {
+            eepromWriteData(EEPROM_NETMODE_ADDR, &mode, 1);   /* ���䱾��ѡ�� */
+        }
+    }
+    log_info("> NET: ������ʽѡ��: %s (%s)", names[mode], key ? "����ѡ��" : "��ʱĬ��");
+    oled_locate(3, 0); oled_print_line("��ѡ:");
+    oled_print((char *)names[mode]);
+    bg_delay(800);
+    oled_clear();
+    return mode;
+}
+
 void app_init(void)
 {
     log_info("");
@@ -127,7 +197,11 @@ void app_init(void)
 
     /* ����ģ���ʼ������ EEPROM ������ϴγɹ���ʽ���ȣ�4G �� WiFi����
      * δ��������ʱ���������� 4G/WiFi �ÿ����ݿ�ת */
-    if (g_mqtt_configured) NET_init();
+    /* ����������: ���� 10s ����ѡ��������ʽ(��ʱ=EEPROM ����/Ĭ�� 4G), ѡ�������Զ��л� */
+    if (g_mqtt_configured) {
+        NET_SetForceMode(net_mode_select());
+        NET_init();
+    }
 
     /* ������·���ڽ��� */
     USART2_StartRx();   /* RS485 ι�ϳ� */
diff --git a/版本说明.md b/版本说明.md
index c9a1194..2a29bd4 100644
--- a/版本说明.md
+++ b/版本说明.md
@@ -21,6 +21,12 @@
   控制命令改三段式：FC03 预读（判定在线 + 快照命令前反馈）→ FC05 → 150ms → FC03 校验跳变；
   命令链路最终无应答即判离线并应答平台 `ext relay board offline`，下次命令自动重新探测恢复；
   断电恢复触发点不变（离线→上线比对 EEPROM 逐路补发）
+- **联网方式改为开机按键手动选择**（废除自动切换）：欢迎页后 10s 倒计时，KEY1(PC6)=4G /
+  KEY2(PC7)=WiFi 固定热点 / KEY3(PB14)=SmartConfig 配网；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，复用原联网方式记忆字节）；**选定后锁定通道，连不上原地重试，
+  不再 4G↔WiFi 自动回退**（4G 无卡/无信号、WiFi 连不上均为每 10s 重试）；
+  WiFi 侧按模式限制连接方式：固定模式只连固定热点，配网模式只走已存 AP+SmartConfig；
+  待配置模式（未灌身份）跳过选择；WiFi 心跳重建、4G MQTTSTATU 健康检查等模式内自愈逻辑不变
 - **4G MQTT 主动健康检查**（移植自老工程 V1.6.6，根治断网假死）：MQTT Ready 后每 60s 查一次
   `AT+MQTTSTATU`，连续 3 次不在线（离线/未认证/查询超时）整机复位；OTA 下载期间（g_net_tx_busy）暂停查询；
   被动 URC 处理保留双保险；新增复位原因码 RSN_MQTT_LOST(18)（BL 的 boot_share.h 同步补齐 16/17/18）。