Yes. Although you cannot run unsigned code currently, the PlayStation 3 can still be bricked. The most common method of bricking a PS3 is switching off the console or removing external media containing firmware information during a firmware update. This can easily be avoided by taking care when updating the console. If unsigned code can be executed on the PS3, it could lead to viruses like the ones seen on the PSP.
Is it possible to brick the PlayStation 3?
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