NodeMCU烧录factory_WROOM-02.bin，AT没反应是怎么回事？

使用 NodeMCU-PyFlasher.exe 和 flash_download_tool_3.9.2.exe 烧录均成功，但是AT没反应。

下面是 NodeMCU-PyFlasher.exe 的日志

Command: esptool.py --port COM3 --baud 115200 --after no_reset write_flash --flash_size detect --flash_mode dio 0x00000 E:\AWS\aithinker\ESP8266-IDF-AT_V2.2.1.0\ESP8266-AT-V2.2.1.0\factory\factory_WROOM-02.bin --erase-all



esptool.py v3.0

Serial port COM3

Connecting....

Detecting chip type... ESP8266

Chip is ESP8266EX

Features: WiFi

Crystal is 26MHz

MAC: 40:f5:20:2c:62:7b

Uploading stub...

Running stub...

Stub running...

Configuring flash size...

Auto-detected Flash size: 4MB

Erasing flash (this may take a while)...

Chip erase completed successfully in 8.9s

Flash params set to 0x024f

Compressed 2097152 bytes to 546983...

Wrote 2097152 bytes (546983 compressed) at 0x00000000 in 48.8 seconds (effective 343.8 kbit/s)...

Hash of data verified.



Leaving...

Staying in bootloader.



Firmware successfully flashed. Unplug/replug or reset device

to switch back to normal boot mode.



换烧录阿里云这个固件AT正常：

NodeMcu-AT-1\Ai-Thinker_ESP8266_DOUT_AiCloud_v0.0.0.6_20170517\firmware\Ai-Thinker_ESP8266_DOUT_32Mbit_AiCloud_0.0.0.6_20170517.bin