Apple Releases Fixed Thunderbolt Update

On June 11 Apple announced a couple of Thunderbolt adapters to provide Ethernet and FireWire connectivity to Thunderbolt-based systems, and issued a driver update for OS X to provide software support for these adapters; however, for a number of users the update resulted in the inability to boot. Apple has reissued a fixed version of this update, which should install properly without any issues.

The driver update is a small plug-in for a required system kernel extension to give it support for the new adapters, but when installed prevented the system from loading the driver properly, which caused some systems to start up to an international no symbol. Attempts to start up in safe mode and otherwise clear the problem did not show any success, leaving reinstalling, restoring from backup, or reapplying the combo update via another Mac the only options for fixing the problem.