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(Mid 2011) MacBook Air EFI Firmware Update 2.9.1 (Info/Download)
(download page linked, but users may want to wait for feedback first)
"MacBook Air EFI Firmware Update 2.9.1 (4.3MB)
This update replaces EFI Firmware Update 2.9 and is recommended for MacBook Air (Mid 2011) models. This update addresses an issue where systems may take longer to wake from sleep than expected and fixes a rare issue that may cause fans to run at full speed after waking from sleep.

System Requirements:
OS X 10.9.2 and later
MBA41.0077.B11" (typo?)

Per an apple doc (later retracted), MBA41.0077.B11 was the EFI version after installing the (pulled) v2.9 update. (The EFI 2.9 update requirements noted having EFI 0077.B00, .B08, .B0E or .B0F.)
The MacBook Air forum may have feedback by the time you read this. (As of 4:30PM, a 13" 2011 MacBook Air owner said he updated OK. Boot rom MBA41.0077.B11 after EFI 2.9.1 update.)
  

Apple/Mac/iOS related News/Updates/Tips/PR:

  
Updated Apple Support/How-To/Troubleshooting Articles:

Apple recently posted Tips for 2011 MacBook Air black screen after trying to install EFI Update 2.9, dated the 25th but didn't see it until later. (See above for new 2.9.1 Update.)
  

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