I just did this the other day too. Like other commentors have stated: it doesn’t fully de-Amazon your kindle unfortunately. Still great, but one thing that bugged me for example was that even after jailbreaking I couldn’t set custom screensavers without paying the $20 to turn off “special offers” mode.

My kindle has long been jailbroken, unfortunately there doesn’t seem to be a way to completely de-amazon it. The device will still always boot to the default kindle interface, KoReader needs to be launched manually. I can’t imagine amazon not having a possible way to “blacklist” the KUAL applet or something.