Answer to the question is:
Put one of our update_*.bin packages that is intended for your model of Kindle, in the root of your Kindle's USB storage, then:
home -> menu -> settings -> menu
if you can install that, your jail broken.
Better yet:
Run the hotfix before doing anything else:
https://www.mobileread.com/forums/sho....php?p=3004892
It will either recover your old, out-of-date, jail break or do no harm.