I got this from Google news - can't remember the specific publication:

PlayStation Portable users looking to modify their gaming system so it can run software that has not been approved by Sony Corp. may find themselves running nothing at all. Ever.

According to researchers at security vendor Symantec Corp. a new Trojan program, called, Trojan.PSPBrick, has begun circulating on online gaming sites. Once installed, the software will delete important system files in version 2.0 of the PlayStation Portable’s firmware, turning the hand-held games into inoperable machines, called “bricks” by gamers.

The Trojan masquerades as a nifty software hack that can be used to disable the PlayStation Portable’s software protection mechanism, said Dean Turner, senior manager with Symantec’s Security Response team. “Once a user installs that Trojan, it deletes four critical files from the machine and a message comes up that says, ‘Your PSP 2.0 is hacked, please reboot.’”