If you find a practical use for it, I'll put it back in (no one has found one so far). Other than that, this is just a bunch of random data, which is most likely not used by the 3DS console at all.
Alright.
@runetoonxx2 &
@Mthodmn101 - could you try this build and show me the output of it?
https://up1.ca/#t5vlqJX27i6P1T9XImjlrg
I'm still somewhat clueless about what may cause this, but with some testing we should find the issue.
EDIT: replaced the link, the last test build had a small problem.
EDIT2: While you're at it, also provide me with some more info... what did you use to format these SD cards, and how did you format them? Is there an EmuNAND on these SD cards? Are there any other known problems with these cards (you could, f.e. run Windows chkdsk over them).
EDIT3: Also, you don't see anything of the menu, right? It freezes rigth after initialization: success?
Seconding
@Xenosaiga here - the slot0x05keyY.bin file is already no more required. KeyX 0x25 / 0x18 / 0x1B are only required for NCCH decryption. NCCHs might also need the seeddb.bin, which will never be complete. So, including those keys doesn't really make sense.