@Alchemy_Gaming
I think i have that error corrected among others for the next version. It'll should be up trough the following days, though the multimode from the beta updates files so you can use that.
@markmcrobie
That error is normal, it means it means when decrypting the nca header the result is not correct, basically it can't see NCA3 or NCA2 in the header which are the header magics used till date so either the magic changed to NCA4 or the header is messed up. The nca header should use the header key so if it's working for other files the key should be fine.
Either way something weird is happening there since the titleid that it's being detected for the xci is the update one, so that means it's not detecting the base game there in either of those files.
Edit: The update magic for minecraft is NCA3 and it's read fine so i bet the issue is with the base.
Ok, the Xci files that were causing the error were all built with NCSB to incorporate previous updates. I re-downloaded the base games and used NCSB to incorporate just the latest update and it works fine. Weird.