EFI boot ROM update problem

I have a MacBook Pro 8.1 end of 2011. I'm updating the EFI boot ROM. There are currently on an old version, MBP81.0047.B2C. Later I can find is MBP81.0047.2AB since the Mac EFI security update 2015-001. I tried to install this rom to boot, but it will not be installed. The update requires 10.8.5 to 10.9.5 but I'm on El Capitan now. I have to go all downgrade procedure first to be able to update the EFI boot ROM and then move on to El Cap again?

You could create a small partition of 20 GB on your HARD drive, get a copy of the full install on a small partition Mavericks Installer. You should be able to re - download the Mavericks since the purchase of your App Store page assuming you got it from the App Store in the past. If this isn't the case, then you are out of luck, unless you can find help at your local Apple store.

Tags: Notebooks

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    I'm a volunteer and I do not work for, or represent, HP.
    ========================================================================
    If you feel that my suggestions helped you, please click on the thumbs-up symbol to say thank you!

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    [If this post was helpful, please click the button "Vote as helpful" (green triangle). If it can help solve your problem, click on the button 'Propose as answer' or 'mark as answer '. [By proposing / marking a post as answer or useful you help others find the answer more quickly.]

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