diff --git a/apps/chrg/applications/thread/chrg_comm.c b/apps/chrg/applications/thread/chrg_comm.c
index b0d2fe3..a64ee3b 100644
--- a/apps/chrg/applications/thread/chrg_comm.c
+++ b/apps/chrg/applications/thread/chrg_comm.c
@@ -27,7 +27,7 @@
 #include "stm32f4xx_hal.h"
 
 #define HOLD_REG_FIRMWARE_VERSION 0x0300U /* 协议板固件版本，只读 */
-#define CHRG_FIRMWARE_VERSION     0x0143U /* 当前协议板版本：V1.1.51 */
+#define CHRG_FIRMWARE_VERSION     0x0144U /* 当前协议板版本：V1.1.52 */
 
 
 rt_uint8_t ucDiscInBuf[(TOTAL_DISC_REGS+BITS_UCHAR-1)/BITS_UCHAR];
diff --git a/apps/chrg/applications/thread/chrg_roll_sou.c b/apps/chrg/applications/thread/chrg_roll_sou.c
index 5936466..e0b00a8 100644
--- a/apps/chrg/applications/thread/chrg_roll_sou.c
+++ b/apps/chrg/applications/thread/chrg_roll_sou.c
@@ -1010,6 +1010,14 @@ void chrg_roll_sou_thread_entry (void *data)
 			LOG_HEX("sendY", 32, pROLL->updata_buf, pROLL->leng);
 			#endif
 			ret = chrg_eload_send_ymodem_data(pROLL->updata_buf, pROLL->leng);
+			#if SOUTH_YMODEM_DEBUG
+			rt_kprintf("south ymodem tx: ch=%u len=%u ret=%d\r\n",
+				single_ch + 1U, pROLL->leng, ret);
+			#endif
+			if (ret != (rt_err_t)pROLL->leng) {
+				LOG_E("ymodem tx failed: ch=%u expected=%u ret=%d",
+					single_ch + 1U, pROLL->leng, ret);
+			}
 
 			rt_mutex_take(pTHR->mutex, RT_WAITING_FOREVER);
 			pROLL->updata_result = (rt_int16_t)ret;
diff --git a/apps/chrg/applications/utils/chrg_def.h b/apps/chrg/applications/utils/chrg_def.h
index 28c3a18..f9f69ff 100644
--- a/apps/chrg/applications/utils/chrg_def.h
+++ b/apps/chrg/applications/utils/chrg_def.h
@@ -14,8 +14,8 @@
 /* CHRG application version. Keep this value synchronized with the changelog. */
 #define CHRG_VERSION_MAJOR       1U
 #define CHRG_VERSION_MINOR       1U
-#define CHRG_VERSION_PATCH       51U
-#define CHRG_VERSION_STRING      "V1.1.51"
+#define CHRG_VERSION_PATCH       52U
+#define CHRG_VERSION_STRING      "V1.1.52"
 
 /*
  * Channel polling mode:
diff --git a/apps/chrg/applications/utils/chrg_ymodem_proxy.c b/apps/chrg/applications/utils/chrg_ymodem_proxy.c
index 5fb3d05..4462095 100644
--- a/apps/chrg/applications/utils/chrg_ymodem_proxy.c
+++ b/apps/chrg/applications/utils/chrg_ymodem_proxy.c
@@ -25,6 +25,7 @@ typedef struct {
 	rt_uint8_t ch;                         // 被锁定的南向功率板通道
 	rt_uint8_t expected_packet;            // PC下一帧应使用的包号
 	rt_uint8_t current_packet;             // 当前已转发帧的包号，仅用于日志
+	rt_uint16_t tx_length;                 // 当前已提交南向的帧长度
 	rt_uint8_t meta_ack_seen;              // 元数据ACK已收到，后续才接受'C'
 	rt_uint8_t eot2_ack_seen;              // 第二个EOT的ACK已收到
 	rt_uint16_t rx_len;                    // 北向当前已拼接字节数
@@ -209,6 +210,7 @@ static int chrg_ymodem_proxy_submit_frame(const rt_uint8_t *frame,
 	int ret = chrg_send_sou_upadata_data(frame, length);
 	if (ret != 0) return ret;
 	g_proxy.current_packet = (length > 1U) ? frame[1] : 0U;
+	g_proxy.tx_length = length;
 	g_proxy.state = next_state;
 	g_proxy.response_tick = rt_tick_get();
 	g_proxy.activity_tick = g_proxy.response_tick;
@@ -484,6 +486,18 @@ rt_uint16_t chrg_ymodem_proxy_poll(rt_uint8_t *output,
 		chrg_ymodem_proxy_session_stop();
 		return 0U;
 	}
+	if ((g_proxy.state == YMODEM_PROXY_WAIT_META_RESP ||
+		 g_proxy.state == YMODEM_PROXY_WAIT_DATA_RESP ||
+		 g_proxy.state == YMODEM_PROXY_WAIT_EOT1_RESP ||
+		 g_proxy.state == YMODEM_PROXY_WAIT_EOT2_RESP ||
+		 g_proxy.state == YMODEM_PROXY_WAIT_END_ACK) &&
+		(chrgrollsou.send_flag == 0U) &&
+		(chrgrollsou.updata_result != (rt_int16_t)g_proxy.tx_length)) {
+		LOG_E("south tx incomplete: ch=%u expected=%u ret=%d",
+			g_proxy.ch + 1U, g_proxy.tx_length,
+			chrgrollsou.updata_result);
+		chrg_ymodem_proxy_abort("south send failed");
+	}
 	response = chrg_eload_get_ymodem_resp();
 	if (response != 0U) chrg_ymodem_proxy_handle_south(response);
 	if ((g_proxy.expected_len != 0U) && (g_proxy.rx_tick != 0U) &&
diff --git a/docs/修改日志.md b/docs/修改日志.md
index 7e765f8..6436116 100644
--- a/docs/修改日志.md
+++ b/docs/修改日志.md
@@ -1,5 +1,13 @@
 # 修改日志
 
+## V1.1.52 - 2026-09-29
+
+### 南向YMODEM发送结果校验
+
+- 校验 UART6 写入返回长度；短写或失败立即记录通道、期望长度和实际返回值。
+- 南向帧未完整写入时立即取消升级会话，不再错误等待南向ACK超时。
+- 协议板版本寄存器 `0x0300` 更新为 `0x0144`。
+
 ## V1.1.51 - 2026-09-29
 
 ### 南向Boot主动握手