I can't think of any reason why I cannot replace the ATmega168P-AU on a BT board with ATmega328P-AU. I would flash the 328's bootloader using the Arduino IDE through the ICSP header. I would use ArduinoISP as the programmer (I have a dedicated Duemilanove set up for this purpose). Has anyone upgraded an Arduino BT like this successfully, or unsuccessfully?
I apologize if this has been answered, but my search only showed this old, unanswered post:http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1286427603
Thanks in advance.