ps vita 374 firmware link

Stay where you are, hack your firmware, and then downgrade. DO update to 3.74 if:

Sony provides several official ways to update your console to 3.74: Direct Update via Wi-Fi System Update Update using Wi-Fi

While 3.60 is preferred, 3.74 is fully hackable thanks to the h-encore² exploit. You will need to use the "Modoru" plugin to downgrade to 3.65 if you want permanent custom firmware later, but starting on 3.74 is perfectly fine.