I think you mean Firmware version 5.12.2.2.
Since your software is > 5.9.x, then you don't need MKK. You need MPRI instead. Please check the KUAL thread, under the section "Important notice for KOA/KT3/KOA2/PW4/KT4 owners, as well as *anything* that might be running FW >= 5.9.x:".
https://www.mobileread.com/forums/sh...d.php?t=203326