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i am sorry but your two answers are quite out of touch, maybe you should read the issue again, No one asked the principle of using internal JTAG to flash,...

also, i use the C3F4H variant (but this changes nothing to the problem).

@SuGlider the CDC is obviously enabled and used, you could have guessed it by the test sketch i gave and the fact i precised the board uses only native USB....

@SuGlider > where do you think the problem is? At this point i am not sure, i thought it could be related to strapping pins latching at a time where...

@Jason2866 no problem and sorry for the harsh tone, i appreciate you came to help.

> Last 2 cents: > JTAG/CDC USB interface uses DTR/RTS bits to reset and enter in Boot Mode. > The way it works can change depending on the eFuses. >...

So, BLOCK0 is all 0, the problem must be elsewhere ``` C:\TOOLS\esptool-v4.2.1-win64\espefuse.exe --chip esp32c3 --port COM42 dump espefuse.py v4.2.1 Connecting... BLOCK0 ( ) [0 ] read_regs: 00000000 00000000 00000000 00000000...

i removed the two buffers, so essentially the ESP32 is now only connected to USB receptacle and tact switch, the problem persists, the plot thickens... I will now replace the...

i replaced the ESP32C3, same problem, so there must be something wrong with what remains of the hardware once the two buffers removed.

the board has been stripped of anyting connected to GPIOs other than pull ups on GPIO2 and GPIO8, tact switchon GPIO9 and USB receptacle on D+ D-. the ESP32C3 has...