Yea..what kind? I don't like how people expect people to already know this stuff.

[CodyTBChkn]

Unpack your ROM with a separate tool.

Originally posted by @kwsch in #562

[kwsch]

Not hard to find a guide on how to use this tool, or how to unpack 3DS ROMs.

The readme has the expectation that you provide the unpacked ROM. This isn't a procedure unique to this tool, hence why it depends on you doing the general prerequisites first.