Please edit that link since it's against gbatemp rules. Instead of downloading the keys paste the needed ones in the template. xci_header_key is optional and can be erased, do it if you don't have it.SX OS 2.5.3. System 6.2.0
Got keys from here:
OEM samsung 256gb microsd fat32, nsp games I've tried to spilt and failed: world of final fantasy maxima, onimusha warlords, ffix, monster hunter generations, and legrand legacy tale of the fatebounds.
Converts and splits the files fine just when I load up the files up in sx os the system crashes when I try to access the homebrew menu or just shows white blocks with unknown developer.
Comments in the keys file are giving issues to the program so it can be related to that.
Did you try using .ns0, .ns1 format or as archived folder (00, 01)? Also did you tried with splitted xci?
Either way i'll try with some of those games in the format you used as soon as I can.