Burning a bootloader onto a Nano?

yes.

I got mine to work..

(but mine was a bit differnt.. remember?)

I was doing a 'minimal' breadboard (+3.3v @ 8MHz internal clock) as my target board...

I just trying to disable the auto-reset on your MAIN board.. (the good nano)

I think its a 100-120 Ohm resistor from rest to +5v rail.. this will disable the GOOD nano from resetting on boot-up or opening up the serial monitor/comm...etc

follow same directions above.. and add that new step to the good nano.. see if it works.