This is the top result when searching for this so I will necro this thread with the possible solution:


1. Tap the menu
2. Tap "Configuration"
3. Go down to "Hardware options" and press enter/return
4. If "6bit EEPROM chip" is ticked, go down to "14bit EEPROM chip" and press enter/return
5. Or if 14bit is already ticked, go to 6bit and press return/enter
6. Basically swap it from whichever it currently is set to
7. Go to Done

The game will reset from the very beginning. After starting a new game, try and save using the built-in method and it should work.