Rock Band Unplugged for the PSP has reportedly been leaked weeks before its official street date. And the actual leaked game seems to be causing a number of PSP glitches including wiping the PSP's game folder and causing the PSP to freeze.
Some gamers have found that their PSP’s GAME folder is wiped after the exit the pirated version, while others have reported the same thing happening once the PSP is power cycled. Meanwhile others are claiming to experience trouble playing music or having their PSP hang unexpectedly since loading Rock Band Unplugged.

Obviously SlashGear does not condone software piracy, and recommends that to avoid any issues with your PSP you wait until Rock Band Unplugged is officially released. The game will hit shelves on June 9th, priced at $40.