How to change firmware password on Macbook air

Hi again all,
Community here helped me to manage to change the firmware on my macbook pro.
I also have the same situation with my macbook air (please feel comfortable, i do not have other notebooks).
How can I change the password at least the firmware password (in order to deactivate it and then proceed to an applejack session) ?
I tried: cmd+R, C press.. Nothing
ps: i do not have any cds, dvd or key
Thx a lot for your help
Jerome

Hi,
Thx for the answer.
I did not receive/have any dvd/cd/key for the macbook air... and AS it is a macbook air so there is no drive anyway...
Is there any other solution to change the firmware password/deactivate it ?
Thx
jerome

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