PSVita

Connect PSVita (not hacked) via USB to Mac / PC

Console modding

H-Encore

https://github.com/TheOfficialFloW/h-encore

supports the newest firmwares 3.65, 3.67 and 3.68

Trinitry exploit

https://github.com/TheOfficialFloW/Trinity/blob/master/README.md

supports the latest firmwares 3.69 and 3.70

https://codestation.github.io/qcma/

https://github.com/yifanlu/psvimgtools/releases

Homebrew

Downgrade PSVita Firm

https://github.com/TheOfficialFloW/modoru

Changing the max sound level AVLS

https://manuals.playstation.net/document/gb/psvita/settings/avls.html

Delete a downloaded update

https://gbatemp.net/threads/how-can-i-delete-a-pre-downloaded-ps-vita-update.437616/