I could install it on my PW6 (Kindle Paperwhite 12th Gen) with FW 5.18.5.0.1.
The kindletool (v1.6.5 found in
https://www.mobileread.com/forums/sh...d.php?t=225030) gave an error: Unknown device C7F.
So I downloaded the v.1.6.6 for linux and used WSL to run it. And it worked. Got my custom bin and installed flawless.
./kindletool extract Update_python3.11_install_khf_11thgenplus.bin python3pw6
cd python3pw6
../kindletool create ota2 -d C7F . Update_python3.11_install_khf_pw6.bin
Then copy the bin into mrpackages and run with
;log mrpi