PW2 KUAL not starting on PW2, ssh working

Hi folks,

Some years ago I successfully jailbroke my Kindle PW2, installed KUAL, Backdoor-Lock, Koreader usbnetswitch and other packages. since it is still version 5.4.2 it worked quite well. Many thanks.
I now used it again after a while and first thought about making an update but it sound like it could deactivate the jailbreak. So i decided to install only a new version of koreader. ( i just deleted the old koreader folders in root ).
But after that KUAL wont start again and the device only connects in USBnet-mode to my PC. I can log in via ssh. So deleted the folders again. It didnt help. Then i put the old folder back. It did'nt help. The last thing i did, was to install mkk. But KUAL is still not starting.
(If i click the shop button, a window pops up, telling me, that there is an error opening the content and that i should contact kindle-support -.- )
Everything else seem to work fine.
Does anyone know this problem? How exactly is KUAL startet?

Greetings