For every activated PSvita/PStv owner Back Up your act.dat license!
Why? The answer is simple, because $ony blocked all hacked Vitas on 3.60 spoofing the latest firmware (3.65) from console activation.
A quote from famous Vita hacker YifanLu.
Tutorial on how to Back Up your act.dat License.
Connect your PSvita/PStv via FTP to your favourite FTP client on your computer & go to tm0:npdrm/act.dat -> copy the act.dat file & store it somewhere safely.
(More info about act.dat : https://vitadevwiki.com/vita/Act.dat )
Visit the forum for more help:
Back Up your act.dat on your activated PSvita/PStv