ESP32 Forum

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



viewtopic.php?f=34&t=21776 这个帖子没看出什么线索，所以又发一贴问问 - -

ets Jan 8 2013,rst cause:2, boot mode:(3,6)

load 0x40100000, len 6960, room 16
tail 0
chksum 0x4f
load 0x3ffe8008, len 24, room 8
tail 0
chksum 0xc6
load 0x3ffe8020, len 3196, room 8
tail 4
chksum 0x3a
csum 0x3a

猜测是硬件和软件不匹配？nodemcu 的板子烧录 nodemcu 固件运行正常，烧录 wroom02 固件无法运行。你可以用 wroom02 的板子烧录 wroom02 固件试试呢，可能就正常了。

接 GPIO2 出来看下系统 log 呢。

使用 flash_download_tool_3.9.2.exe 烧录成功那应该下载是没问题的，可能固件版本和你的硬件不匹配，比如默认 AT 命令口使用的 UART 引脚不一致。FACTORY_WROOM-02.BIN 固件默认使用的 AT 命令口 UART 引脚为 TX:15 RX:13。