I guess I should post this here.
https://www.mobileread.com/forums/sho...004#post963004
1) Install the "jailbreak". The kindle will say that it failed to update, and this is fine. You only ever have to do this once. This just adds Jean-Yves public key to the kindle so that we can sign our own packages again.
2) Then install/uninstall the screen saver hack as normal.