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Q: my Mac start with EFI password (Frimware password)
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Aug 9, 2015 12:34 PMby lllaass,If your Air is:
- MacBook Air (Late 2010 and later)
then
If you forget your firmware password
If you can't remember the password you set using the Firmware Password Utility or Find My Mac, schedule a service appointment with an Apple Retail Store or Apple Authorized Service Provider. Bring your proof of purchase (original receipt or invoice) with you. If you plan to visit an Apple Retail Store, make a reservation (available only in some countries).
Above from:
Use a firmware password on your Mac - Apple Support
Otherwise follow the instructions here fro removing one sick of memory and booting
http://osxdaily.com/2009/10/19/bypass-mac-firmware-password/
