Originally Posted by ersott
I Need back my kindle to factory default.
It have installed: jailbreak, personally screensavers and adiccional fonts.
Is enough with touch the kindle option "reset to factory default"? and then apply upgrade 5.3.1, or perhaps i need to uninstall everything before do it...
"reset to factory default" does not do quite what the name sounds like it would do.
remove anything you added.
return to original anything you have changed.
uninstall the things you have installed (jailbreak last).
Then do the upgrade.
Note: You will not be able to jailbreak the new software - but from your post, I think that is what you want.
If not, then do not remove the jailbreak - it will survive the update.