I’m going to order that UART of amazon henryk mentioned in hardware-needed-for-bootloader topic
I already used 2 different USB-C cables (one of my smartphone that definetely is able to transmit data). And I tried different USB ports at my PC.
Anyway I’ll give the amazon UART a shot and will see.
If nothing helps I have to flash the ESP32 box which was actually intended for my parents if grandchildren making sleepover there