Connect a Telink TLSR8252 or other supported SoC to a USB-to-UART Converter.
From Converter to SoC, connect wires as following:
VCC -> VCC
GND -> GND
TXD -> SWS
DTR or RTS -> RST(Optional)
Enter the FindMy/OpenHaystack Public
key in the field,
click on Open to select your COM-Port.
Flashing
will start immediately.