>>3125
Gen 4 iPad runs iOS 10.3.3 which is pretty out of date but you might still be able to get a retard to buy it, people who buy apple products don't understand shit like planned obsolescence, EOL, and probably don't understand that the operating system doesn't receive updates anymore. If you want to jailbreak (I don't know what kind of software cydia might get you) this is apparently what you need for 4th gen iPad.
https://h3lix.tihmstar.net/
With that being said, I wouldn't even bother doing it, I'd just reset it to factory and try to sell the thing. I'm not into tablets and wouldn't buy one for any reason but if I had to I'd probably go with MS surface, run me_cleaner and install whatever distro has the best support (apparently that would be ubuntu from what I understand).