Late Thursday, Apple released its MacBook EFI Firmware 1.9 update for its 15″ and 17″ mid-2010 MacBook Pro notebooks. The update, a 2.2 megabyte download, resolves a rare issue that may cause the system to freeze during startup or intermittently stall during operation, and it improves compatibility with external displays.

As always, the update can also be located and installed via Mac OS X’s built-in Software Update feature.

The MacBook EFI Firmware 1.9 update requires an Intel-based Mac running Mac OS X 10.6.4 or later to install and run.

If you’ve tried the update and noticed any major changes, please let us know.