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Frage: Firmware problem updating to High Sierra


I have the following problem with trying to upgrade to High Sierra (10.13.2). Whenever I try to install, it fails with the notification that a problem with my firmware has occurred.

I have already gone through the solutions that I found on FAQ sites, which are SCM reset, NVRAM reset, hard drive repair and EFI and SCM firmware update. I have done everything except the EFI firmware update and that seems impossible to me, because the latest firmware that I can find is MBA51.00EF.B04 (2015-002) (on my Macbook there is MBA51.00EF.B02). Unfortunately, the firmware update is only for OS 10.9.5 and I have 10.12.6. Since I don't have a backup in my time machine with Mavericks anymore I don't see an opportunity to complete this last step and of course, I don't know if that would enable me to update to High Sierra, either.

Does anyone have an idea what I could do to somehow come closer to a solution?

Many thanks in advance!

MacBook Air (11-inch Mid 2012), macOS Sierra (10.12.6)

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02. Jan. 2018, 17:05 als Antwort auf VeiSt Als Antwort auf VeiSt

Hello, VeiSt!
Thank you very much for posting your question in the German Apple Support Communities. We have a Community for English speakers here.
Please feel free to join and post your question there.
Have a great day.

02. Jan. 2018, 17:05

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Frage: Firmware problem updating to High Sierra