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Find the correct version of Firmware Restoration CD

Halo guys

Since my mbair make SOS beep (3 short, 3 long, 3 short)

so i need to restore the firmware, but after i go to apple sites and searching for the right version for my macbook air 3.1 still no luck finding it

https://support.apple.com/en-us/HT201692

HELP !!

Thanks

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Looks like this is an orphan Tech Note: About the Firmware Restoration CD (Intel-based Macs). I think your best bet is to take the system in to an Apple Store for them to re-flash your firmware. You might want to bring a copy of this T/N as well.

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