Edison Carter has updated his Trainer for the PSP Game”Liberty City Stories”. A few supported cheats are: Infinite Health and Armor, Set Wanted Level, Set Time, Set Weather&Spawn Anything. Changes:

v0.8 release notes:Rocket Boost gives you forward thrust whether you’re on the ground or in the air or upside down. Settings 1 or 2 are good for fast driving on the ground. Rocket Boost 10 is good for making bikes fly.I added the ability to turn your motorcycle in the air while using Rocket Boost.

http://www.maxbot.com/gta/