ESP8266 OTA更新失败的原因？

我的咖啡机里有一个 ESP8266。它已经运行了两年，今天我想使用 OTA 更新它。它奏效了，第一次。但是我代码写错了，现在需要重新上传，卡住了。我看到的错误是“536”。
代码：全选D:Mina DokumentArduinoMQTTmqtt_kaffe_v002>cd "D:Mina DokumentArduinoMQTTmqtt_kaffe_v002"

D:Mina DokumentArduinoMQTTmqtt_kaffe_v002>python.exe "D:Mina DokumentArduinohardwareespressifesp32toolsespota.py" -i 192.168.1.156 -f "mqtt_kaffe_v00
2.ino.d1_mini.bin" --auth=CEf76lllSEFQqqfc
15:57:02 [DEBUG]: Options: {'esp_ip': '192.168.1.156', 'host_port': 51463, 'image': 'mqtt_kaffe_v002.ino.d1_mini.bin', 'host_ip': '0.0.0.0', 'auth': 'CEf76lllSE
FQqqfc', 'esp_port': 8266, 'spiffs': False, 'debug': False, 'progress': False}
15:57:02 [INFO]: Starting on 0.0.0.0:51463
15:57:02 [INFO]: Upload size: 477696
Sending invitation to 192.168.1.156
Authenticating...OK
15:57:03 [INFO]: Waiting for device...
Uploading.......................................................................................................................................................
................................................................................................................................................................
............................................................................................................................................................
15:57:16 [INFO]: Waiting for result...
15:57:16 [INFO]: Result: 536

15:57:16 [ERROR]: 536

D:Mina DokumentArduinoMQTTmqtt_kaffe_v002>pause
Press any key to continue . . .

我怎样才能找到 536 的含义？