Thanks to PSVIMGtools released last week, there are a couple of PSVita hacks you can now do again like VHBL on your up-to-date Vita/PSTV or even on lower FW. Here are some of the updated tutorials from our PlayStationGuide that could be interesting for you: especially if you are on FW 3.70.
How to install an ARK eCFW Bubble
How to make homebrew & emulator Pboot bubbles for the PSVita