You're using the wrong version of KUAL. Azw2 file is a "kindlet" version of KUAL and that firmware build doesn't support kindlets. You need to install (via MRPI [MR Package Installer] and " ;log mrpi" search-bar command) the "booklet" version (probably?? "coplate" sub-version) of KUAL using a .bin installer file downloaded from here:
https://www.mobileread.com/forums/sh...d.php?t=225030