I bricked it, trying to deinstall ScreenInv.
Because it's probably not the last time, I made myself a very easy 5-step program: Only plugin, copy to folder, plugout, repeat x4.
All files and instructions are in the 5 folders and I've uploaded the 50MB to
dropbox.
-->This will get a Aura HD from version 2.6.1 to a device which has laucher.png opening up to Koreader v2013.03-273 with light, sleep, usbnet, wifi, dictionary support in pdf and a few tweaks for the Filemanager.<---
If you have an other Kobo, you're good for points 1 to 4. Delete all files which form pairs, e.g. menu.lua and menu.lua-old in directory 5. Do step 5.
If you want Nightmode/ScreenInv follow these
instructions.