Burn bootloader on custom ATmega 2560 board I have developed and produced a custom board with a ATmega 2560 on it and a FT232RL for USB communication. I want to burn an Arduino bootloader onto the board without using an external Arduino as ISP. I can't seem to figure out how. 
When I just click "burn bootloader" from the arduino software it says: 

avrdude: stk500_recv(): programmer not responding

What am I doing wrong and how can I correctly burn the bootloader?
To burn a bootloader you have to use some external device. That can either be another Arduino or a hardware programmer, like an USBASP or something similar.

You can't just magic the bootloader on there through the USB and a dose of wishful thinking. To use the USB you first have to have the bootloader on there.