I bought an already made GM328R from eBay which works but looks like it was made by a drunken Boy Scout on a Friday afternoon - all the components are mis-aligned. Anyway it works. I want to upgrade so a few quick questions:
1. Will the new firmware that madires just linked to (vn 1.25m I think), work on the GM2328R?
2. I have some 20 MHz but no 16 MHz Xtals, can I fit a 20 MHz Xtal and use the new (or another) firmware or would you recommend 16 MHz?
3. I just bought a TL866A programmer so I'm new to it, it starts to read the ATmega328 and then comes up with "read error code 31"; is this because the AVR is locked?
4. I think I can reprogram by erasing, then load the data and eeprom areas (as Intel hex), and then set the fuses, right?
Thanks for any help in advance.
BTW, I'm a self-employed hardware / PCB designer. If someone sends me a schematic for the new circuit, I will design the PCB for the community.