If you've ever wanted to go back to an older firmware on your PlayStation Vita, then your wishes have been granted. Renown Vita scene hacker TheFloW has released a brand new homebrew tool called Modoru that allows you to downgrade your firmware. This software can be used on any Vita running OFW 3.60-3.68, and allows for anyone above OFW 3.65 to downgrade and apply a permanent hack, Henkaku Enso, to their system. Those on 3.69 and above cannot use it at this time, but once an exploit is available for those firmwares, they will be able to.
You can check out the program on TheFloW's GitHub, linked below.