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Original post by: Jan Reher ,

Text:

Hi, I bought a 2009 A1304 Macbook air with firmware password set, and no OS X installed.

So I get the HDD from the Macbook Air and installed El Capitain 10.11 with a Macbook pro used the HDD as external drive with a special connector. That was  a little bit tricky with the ribboncable. After I installed the drive  back in the Macbook Air it boots successful. Then I open a Terminal shell and call nvram -c and set a new firmware password with firmwarepasswd and deleted it with the command to ensure it was written to the EFI chip. Now no hardware password is set and I can boot from external devices.

nvram -c

firmwarepasswd -setpasswd             (I use 1234)

firmwarepasswd -delete

Status:

open