iMac EFI Update 2.0

This update is recommended for the iMac (21.5-inch, Late 2012).

This update contains general performance fixes pertaining to sleep and Thunderbolt, and improves compatibility when using the 5GHz band in Wi-Fi.
Boot ROM or SMC Version Information: After Update is complete:

Build version:  010A.05
ROM version:  IM131.88Z.010A.B05.1211151146