Avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt x of 10: not in sync: resp=0xxx

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Hi @328trung.

Please note that when you do that the bootloader is erased. So you must remember to perform another "Burn Bootloader" operation when you want to switch to uploading sketches to the board via the UART converter.

Please add a reply here to tell us the exact connections you have made between the UART converter and the Pro Mini board.