Just put the 2 PRX files into your exploit savegame folder and PSX (PS1) games should be working from the TNMenu. Other menus aren't tested yet.
This should be working with every TN-C release for the PS Vita. The PS Vitas OFW shouldn't be important, it should be working for 1.6x, 1.80, 1.81 and 2.0x firmwares (available soon).
Greetings The Z
Credits:
Total_Noob (For all his work involved in the PSP and PS Vita scene)
Frostegater (For compiling the POPCORN.PRX file from the TN-C sources)
http://www.youtube.com/watch?feature=player_embedded&v=QwqBo_faAIk