i'm trying to install Another Super Mario Bros. 2

the xdelta rejects the rom (that worked for newer), saying "An error has occurred: xdelta3: target window checksum mismatch: XD3_INVALID_INPUT"
so i think ok, well there's also a .nmp
i can successfully patch it in nsmbe, but i can't figure out how to export anything i can use (exporting an xdelta also rejects with the same error)

am i missing something or...?

Make sure the rom you're patching is (U) region and not (EU), also, make sure that none of both roms you're patching has been opened in NSMBe before or any other program, since it can cause errors most of the times, if you're still getting errors you could try with other rom, I haven't patched any roms with NSMBe but I have understood that it's not recommended using NSMBe to patch them
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I'm also working on a hack in collaboration with  crook,  Rph,  Digital Cheese and  RetroAleXD. Check out this thread for updates.

it is
i even tried two different u roms and it still doesn't work


dependent on the filename, the file, or the file's contents (making sure)
cause i've failed all of those but i can start over on the first two
i will note though i tried the xdelta before i even downloaded nsmbe so that can't have been the initial problem

My apologies, I didn't read the post correctly. Since the xdelta patch isn't working, try the NMP patch instead, after patching it with NSMBe, you must close the editor and you're ready to play it, you just have to change the name of the rom you patched in your desktop
_________________________

My YouTube Channel

I'm also working on a hack in collaboration with  crook,  Rph,  Digital Cheese and  RetroAleXD. Check out this thread for updates.

outta curiosity, wheredya get the patch? do you think you could send a link?

oh, it did patch
it just somehow has the exact same filesize

https://nsmbhd.net/post/52296/