Sure thing then, if I don't discover how to do it I'll tell you.
And thanks for the tip about BBB, but I won't actually use WiFi (all I want is KOReader

).
[Edit] knc1, I placed the hotfix .bin file inside a folder in the root directory. Then, through SSH, I used cd to get to that folder (cd /mnt/us/folder) and tried to execute the file with ./hotfix.bin (also tried chmod +x hotfix.bin before executing), it gives me the following message: line 1: syntax error: unexpected ")"
Is it something along these lines or am I WAY off here?
[Edit 2]
It's working!!! YES, YES, YES, I can finally sleep now!
I found NiLuJe's KindleTool:
https://www.mobileread.com/forums/sh...d.php?t=187880
And used it to create a tar.gz file of the hotfix. Then I used the commands I mentioned above and installed the 2 .sh files. Rebooted the device and installed KUAL (also using SSH and .sh files. I don't know if it was needed, but I did it this way). And now KOReader opens again!
Thanks a lot for all the help and developing, knc1! Tomorrow I can give you more info if you want (now I really have to sleep)