What firmware version? I haven't broke my Vita so I don't really have the fixing experience, but maybe reinstalling the firmware could help https://cimmerian.gitbook.io/vita-troubleshooting-guide/serious-problems/bootloop
Assuming you use a non-permament hack that you can't exactly use now, I'm not sure how you could put the files there if you got them.
I'm on 3.68. Thanks for the link the instructions there are really detailed for an idiot such as myself.
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