When looking into my crystall ball, I even suspect that the downgrade protection in the firmwares >5.8.8 is actually only the first step. I fear Amazon in the future could use methods to even prevent the execution of the "emergency script" at the end of an firmware update which is used to launch the "hotfix" code". If this happens, a jb will no longer survive an update. And, BTW, @knc1: This would require no changes to the user directory. The /mkk/* (i.e. "jb hotfix") content will not be affected in any way - it would simply no longer be executed automagically after a fw update. Result: Kindle lost the jb.
Hopefully, Amazon would never do this - but who knows?!
Gesendet von meinem Google Pixel mit Yabba-Dabba-Talk.