Well, I have burned bootloader for Arduino Uno to my nano using another Arduino Uno as ISP. Now my nano refuses to program - 'programmer is not responding: resp = 0x0e / 0x9e / etc'.
Note: When I was burning bootloader, avrdude refused to do it, it said 'invalid device signature, double check the chip'. The signature was different by 1 byte from original. So I used -F (--force) flag to do it. Process has completed without any errors.
Did I break my bootloader or something?