[jma1]

I have a Kindle PW4 that recently auto-updated to software 5.15.1.1. If it is possible to jailbreak, install a prior version of software, and prevent auto-updates even while wifi connected, could someone point me to the correct procedures?

I just want to get back to a software version that supports the 'original' Periodical document format viewing and toolbar functionality.

Thanks in advance.