Where is the ESP32 chip and how is it oriented?

Dear all,

I have a TTGO T-watch-2020-V1.
Until recently, I was able to upload my programs without problems.
But now, I get this error:

esptool.py v3.1-dev
Serial port /dev/cu.usbserial-0200D10B

A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header

I have searched via google and found several solutions.

People on the internet suggest to hit the reset button or the enable button. But the watch does not have these buttons.

People on the internet suggest to take GPIO pin 0 low and to solder resistances and capacitors from one pin to another.

Can anyone help me find these pins?
I made a picture:

I see an indication of CP2101 (the USB to UART bridge), but no chip with ESP32. I would expect such a chip to have some indication of how to position it (when you want to put it on some board) (a dot or an indent), but I do not see any of that. So: where is my ESP32, and how can I find out the orientation of the chip. Or is the ESP32 chip somewhere hidden on the other side of the print?

Kind regards,


I suggest that you contact the manufacturer and report the problem.

RV mineirin

Sem título2

If you lookup the pinout of the ESP32, it should tell you which pins should be connected to GND and which are connected to VCC.

So with a simple continuity tester you can work out which pin is which.

In this case, remove all batteries &c.

Sry, really just wanted to see if posting a tube link worked.


Thanks for your pictures. This helps a lot. I also found a pinout of the chip at Mouser:
So altogether I should be able to find out which pin needs to be grounded.

Now that I know where it is and which pin is which I will indeed use my multimeter to check the VCC pins…