Quick question: when I registered my device after I had everything setup the way I wanted, I got a document that showed up saying something to the effect that my kindle test device was no longer active. Does anyone know what this means? Screensaver and font hacks are still working, so I'm just curious.
Anyway, here's my trial and tribulations leading up to the end result. Just wanted to post it up here in case anyone happens to stumble into my predicament.
So I tried to install the various jailbreak styles on my K4, none seemed to work well enough to get either the screensaver nor the font hack to install, so I gave up and used the simple debrick method to flash back to 4.0.0 since the 4.1.0 image didn't load properly (talk about a scary moment when it didn't boot up properly...true test of the debrick procedure!)
Got the 4.0.0 image loaded, only to find out that the 4.1.0 update wouldn't work (because the 4.0.0 image has a renamed screensaver directory with a link; deleted the link and renaming the directory fixed that). Afterwards I tried
Yifan Lu’s jailbreak but it didn't work, so I tried booting into recovery mode and rebooted a few times there and that was what finally worked.
I do want to note that some folks reported that this particular method bricked their kindles, so I would be careful. On the other hand I had already bricked mine a few times (and recovered from it) so I was feeling brave
After that, it was a fairly simple affair of installing the screensaver and font hacks via the standard method and I now have a fully functioning K4 with all the trimmings. Thanks for everyone that took all the work, effort, and documentation to enable me to get this far with just searching!
I do have to say being familiar with linux sure helped, as I was more comfortable ssh'ing around the file system than I was dropping packages into the mounted partition.