[Antinoos]

I've used all my newer Kindles (PW3 and KT3) permanently offline only. Never once registered them with Amazon; sideloaded all my documents from other sources.

As opposed to the (outdated...) tip in the jailbreaking thread, I even skipped the "step 0" recommendation to once register them before doing the jailbreak. A few days ago I've learned in this forum how to apply a fake tegistration to jaibroken Kindles 7th generation and up. Now I even have the menu entry for managing collections. Though I never used it, as I'm mostly using Vlasovsoft's CoolReader for reading EPUB and MOBI files, and the Amazon standard softwarr just for PDFs and some old PRC files. Or I skip over to KOReader if I like. All are ways better than Amazon's standard (except with scanned PDFs, where the standard software is really good).