Problem with starting KUAL and Vlasovsoft

Hello everybody :-)

I've jailbroken my 2 devices Kindle PW3 (factory jailbreak on one device and Kindlebreak on the 2nd). Jailbreak worked, then I installed Hotfix, but I cannot run KUAL nor the Vlasovsoft package. In both Kual and VS starting element is the .azw2 file in documents folder which is not visible in the reader menu. Does anyone know how to solve this problem and run KUAL and VS on these devices?
When I use it on PW2 with 5.8.7.01 it works perfectly. I suppose that the newer firmwares- factory 5.9.6.1 and 5.11.2 don't see the .az2 files of KUAL and VS.

Thanks for the help :-)