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Thunderbolt Firmware Update fixes MacBook Pro, cable issues

Apple on Tuesday released Thunderbolt Firmware Update v1.1, which patches a problem that caused some MacBook Pros and Thunderbolt cables to experience malfunctions when connecting to a bus-powered peripheral.

Thunderbolt Update

The update applies to MacBook Pros built in mid-2012 and "some" Thunderbolt cables, however it is not clear if all cables are affected, or just those made by Apple.

From the release notes:
About Thunderbolt Firmware Update v1.1
This update addresses an issue with MacBook Pro (mid 2012) and some Thunderbolt cables that may prevent bus-powered Thunderbolt devices from functioning properly.

Thunderbolt Firmware Update v.1.1 comes in at 442KB and requires OS X Lion 10.7.4 or later. It can be downloaded through Software Update or Apple's dedicated support downloads webpage.