This post (
https://www.mobileread.com/forums/sh....php?t=3658130) suggests me it is a bad idea to reset a jailbroken kindle. I was about to do a DO_FACTORY_RESET method as described here
https://www.mobileread.com/forums/ne...eply&p=4482251. Now I'm confused, is it risky? Should I run a vanilla firmware update via sideloading first before doing this?