KUAL works with both 5.3.1 and 5.3.3 -
BUT you **must** jailbreak while on 5.3.1 !!!
And then replace parts of the jailbreak after upgrading to 5.3.3
For hints, see:
https://www.mobileread.com/forums/sho...&postcount=192
You can stop once KUAL is again operating (right after slash's solo).