Reply To: Cannot get Genesis/Megadrive ROMs to work

[sselph]

This error is thrown when picodrive can’t determine the media type. Here are some of the possible issues I can think of:

• If the version of picodrive you have doesn’t support the .gen extension. Try renaming one to .bin to test and if that works you might try downloading a fresh 2.3 sd image.
• A less likely option, since you said they work on a friends retropie, is that the files are not a raw binary file and are in the multi game doctor format which isn’t supported in picodrive and you can convert them using a tool like SBWin to a bin.
• The files were corrupted during the copy.