AGB_FIRM has some kind of AES-MAC type hash protection for saves used with GBA games. (probably to deter people using saves as exploits to find holes in AGB_FIRM?). So good luck getting around that when injecting a save. The "logo.bin" file used in games uses something like this too. But as we all know, hblauncher_loader got around that as they are using a custom logo. So I suppose it's a matter of time if there's enough interest in it.

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