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That was actually one of the first things that I tried. But it didn’t reinstall the AdvanceMame emulator- it seems to have just updated it. I’m still having the config bindkey issue. And since RetroPie 3.0 is so new, there aren’t any resources online that point to a solution, yet! I found a mame.cfg file in opt/retropie/emulators/, but it doesn’t contain any keybindings for the MAME config menu that’d normally be accessed using the Tab key.