[mammouth]

Hi all!
I have a kindle KT3 a KOA3 too. I have succsess with the KT3 (fw5.14.2) about half a year ago, its perfect. about 1 week ago i bougth the Oasis 2019 from second hand with fw 5.14.2 and i tried 3-4 times to JB it and install the KUAL and KOreader with partially success. with the JB procedure I havent any issues, thru the tutorial i have done the JB, and i have installed the hotfix too, extracted the mrpi installer. but i cannot install the KUAL booklet anyway. i was tried, to copy the "Update_KUALBooklet_v2.7.29_install.bin" file to the "mrpackages" folder and then ";log mrpi" the installation seems finished but no KUAL "book" appears anywhere on the kindle. tried the hotfix version too, same thing. what have I made wrond?
another bad thing happens today: i have forgot to put the device to airplane mode, and it have updated itself to 5.16.2.1.1.. no comment i know!
the interesting is: ";log mrpi" running if I call it, (i have tried to install KUAL booklet again, no success) and i think jailbreak survived. but i have no KUAL icon, and in this case i cannot downgrade the device with kual downgrader.
please give me some advice/opportunity. till your helping answer I do not reset or do anything with my device, and hope there are some possibilities to downgrade, and use the KOReader later on it! i love it so much!
than you in advance!
Adam