First generation Paperwhite? PW1 can be downgraded back to 5.4.4 ( you copy over firmware bin file and force a reboot by holding the power button on Kindle,
without ejecting the kindle drive from your computer) and then jailbreak using this old jailbreak method:
https://www.mobileread.com/forums/sh...d.php?t=186645
After doing the jailbreak
and installing the hotfix you can then update back to to the latest firmware (5.6.1.1).