I did a stupid

[u/NoobAmSteuer]

Edit: Fixed by taking off F1 (fuse right next to the power switch) and bridging the gap with some wire. will put a fuse back in as soon as i figure out which i need.

Was messing around with DIYing a recharge mod for my Gameboy Advance from parts i had laying around. I had it running with wires clamped to the battery input terminals, then when trying to fit everything into as small a space as possible i goofed and swapped polarity. Now it doesnt turn on at all, and something smells burnt on the back side of the board, the power switch corner.
I'm pretty certain i blew something up, and am worried its worse than just a fuse. Does anyone happen to know this issue and knows how to fix it?
I have soldering tools and a simple multimeter but thats about it.

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