The bootloader is uploaded to the ATmega328P succefully, but when I connect the ATmega328P to an Arduino UNO through RX TX ports the IDE tells me this,
I have checked all the wire connections etc. and nothing wrong. There are only 4 wires connecting the board, 5V, GND, RX, TX.
Arduino UNO is also tested with its original processor, blink can be uploaded to it so its working fine.
Any suggestions on this weird issue?
Thanks in advance!