For anyone that buys a pre owned vita game

[ETC]

I have stumbled on this method that brings back trophy support (trophy support does not come straight back on for anyone other than the first user if the cart saves its own data)

To reactivate trophy support put the game in then it installs then press it (touch panel) then delete all data (of the game from your vita) then turn vita off then back on and it will reinstall and then trophy support comes back

took me ages to find that out hopefully will be of use to people