@stanszal 在 Simple fix when upload fails. 中说：
I am using win7 and arduino ide 1.8.5. The board automatically selects the com port when plugged in . The port varies .
I have the cap soldered onto dupont leads and have them plugged all the way in. I tried both polarity's
I keep getting the "timed out waiting for packet header " error. for whatever reason it won't connect. I have no problems with the ports with various Arduino boards, ESP8266's and ESP32's
As a note, I am having the exact same problem. I'm using PlatformIO, but the esptool output is the same indicating the same underlying error.
When I look at the Serial Monitor, it's booted and here is the output:
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
mode:DIO, clock div:2
user code done
I recovered mine using the EspressIF ESP32 Download Tool following the M5 guide for loading their MicroPython / Cloud IDE firmware.
I wanted to play around with their cloud IDE anyway, but you should be able to use the factory firmware (also on GitHub) or one of the ones in your Arduino compile cache that you know works.
Edit: Forgot to mention, I did have to use a 10uf cap across the GND and RST pins as described earlier in the thread in order to get the EspressIf tool to be able to connect.