I'm the happy owner of an Everdrive GB (Model ED-GB V1.2 with OS version 4; not the newer X-Versions).
I'm using it with my GameBoy Pocket.
Just out of curiosity: What are those Mapper-settings for? (You can choose between MBC1, MBC2, MBC3, MBC5 and ROM)
I have the "Save RAM"-Option activated...