(alternatively copy the saves to your ux0 root on your vita and transfer via usb) Connect to your pc via ftp and copy over.Hover over the GAMEID and press triangle then select open decrypted.Open Vitashell, Navigate to Ux0:user/00/savedata/GAMEID (for my persona 4 this is PCSB00245 but I think it varies by region).save in slot 5 if you are transfering a save from it). You need a modded vita, a Hex Editor, and an FTP client, and to make a save data on PC (You also must transfer the same data slot, i.e.
