Yeah the bad thing is that this won't be good in portrait mode... and Amazon doesn't let us rotate 180 degree to be upside down.
But recently I have started reading in landscape anyway because... we can - it's better no? We have 2 eyes, horizontal, we see 'wide', not 'tall'. So I think landscape makes more sense really!
But yeah, I think I asked for an upside down 'hack', I forgot how that worked out.
To use KindleLazy (or any KUAL app) - first jailbreak.
https://www.mobileread.com/forums/sho...d.php?t=275877
Following the whole guide, you will have KUAL installed (the app launcher).
Then just copy KindleLazy to your 'extensions' folder when you plug your kindle into your computer. Go to KUAL, and start KindleLazy. Action.