Today I figured out on a problem during flashing an ESP32 WROOM dev board, during upload of firmware I received MD5 does not match. I performs many test:

• Change flash station
• Rebuild the code
• Change flash parameters
• Upload new code using OTA

I realize that there is something that does not grant to write to flash. I just thinking to replace FLASH on board when I found this solution

esptool.py -p /dev/ttyUSB0 write_flash_status --non-volatile 0

After that command I was able to re-flash ESP32 both using USB or OTA.

Hope this would help others!