RSS How to check cartridge region?

[GBATEMP]

First of all, I can't depend on the label that's on the cartridge being accurate as the ESRB version I supposedly bought is worth $150 and the PEGI version of the same game is worth $25. The game is used, which makes me want to check this even more.

So are there any homebrew that can check the cartridge itself for the region?

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