UART connection for firmware upload not working - #23 by feynman137 - General Electronics - Arduino Forum
Amazon.com: DTECH FTDI USB to TTL Serial Adapter 3.3V Debug Cable 6 Pin Female Socket Header UART IC FT232RL Chip for Windows 11 10 8 7 Linux MAC (3ft, Black) : Electronics
UART connection for firmware upload not working - General Electronics - Arduino Forum