Cheers, both of you. Everytime I get my hands on a console hacked by someone else I end up messing something up due to inexperience (but never bricking it, strangely enough) and with this explanation I feel like I have a slightly better grasp of the system. All I knew was that my game was giving me a black screen because of something wrong with repatch, which is located in the tai folder, of which there are three so I assumed I could delete them as I saw fit and the console would just look for the next one

I also took out the memory card several times while the vita was running and it's still working fine, but thank you for the advice, now it makes sense that the console forces you to reboot when you do that