The M3 Real expansion pack won't work on anything other than the M3 Real as far as I know.
Normally I'd recommend the EZ-V 3in1 expansion pack, but it appears that they've started using different internal chips, so the homebrew loaders need to be updated to account for this change. Until that happens, only the EZ-V cart will work with the newer 3in1 units. The other option is the Ewin 2 expansion pack, though this has lower GBA compatibility.
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