- According to AltPlusF4.com (linked above), PS3 Firmware 2.70 is causing bricked systems. However, they are not bricked, just 'locked up' primarily due to certain brands of PS2 to PS3 USB adapters being plugged into the system.
So for now, simply do not use these adapters on the new firmware.
To quote: The PS3's 2.70 firmware is causing some havoc out there with reports of bricked systems. They're not bricked, do not reformat....