ESP32 Forum

I tried to flash ESP32 from PIC32MZ MCU through UART protocol, but when I send a command (SYNC command) to ESP32 loader, there is no response from ESP32 loader(I am sure that ESP32 have already been in download mode). And I checked transmited data to esp32 by analyzer(correct data), but on the response line there is nothing.
This is so weird that when I send the same command by another ESP32, it worked normally.
Please help me about this problem.

Hello, I think I may have the same issue. I noticed that when I send two SYNC packets, my ESP starts to reply normally. Now, this is a workaround in my case, I do not know if it will work for you.