If you are still at 5.6.5 or any any case less than or equal to 5.9.6.1, you can do a reset to clear everything, then follow this thread
https://www.mobileread.com/forums/sh...d.php?t=313086 to have a 5.9.6.1 jailbreak PW3. You would have to use booklet KUAL instead of kindlet KUAL