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For me the fix was saying to Update Tonight, not Update Now.
I tried using terminal commands as well as all the suggestions above to no avail.

But this trick actually worked.

Thanks for posting the tip.
 
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Go in system settings>iCloud>Find My. Disable Find My Mac.
Update.
Re-enable Find My Mac.
 
Go in system settings>iCloud>Find My. Disable Find My Mac.
Update.
Re-enable Find My Mac.
That didn't work with the beta installation problems yesterday- it was an outage on Apple's side that is now sorted out.
 
I also ran into this problem when i tried to update from 14.7 to 14.7.1
I spent many hours to solve it. I tried all of the tips in this thread, nothing helped...
What i did: i made a USB Stick as of Apples guide: https://support.apple.com/en-us/101578 with the version i wanted. In this case i had to download the full-installer with 14.7.1 and made the stick.
I booted from the stick and installed the whole bloody thing on my internal HD. I feared to lose files with this install-method, but i didn't. All was there after finish and a reboot.
I ended up with 14.7.1 on my internal HD and working capability to upgrade to 15.1 , which also didn't work before under 14.7 - update to 15.1 is running now.
I hope i'll never run into this update disaster again.

So a fresh OS Install from USB Stick solved my "could not obtain device identity information through SFR installer" / "Das Softwareupdate konnte nicht personalisiert werden. Versuche es erneut."
 
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I had this issue with my MBA M1 and I contacted apple support, tried everything in this forum, tried to reset my Mac, bricked it, took it to the Genius Bar and even they couldn’t get it to do anything even booting it to DFU mode ot wouldn’t report its Serial and they sent it to the service center. They replaced the mainboard and touch sensor. Got it back with Sequoia installed.
 
I had this issue with my MBA M1 and I contacted apple support, tried everything in this forum, tried to reset my Mac, bricked it, took it to the Genius Bar and even they couldn’t get it to do anything even booting it to DFU mode ot wouldn’t report its Serial and they sent it to the service center. They replaced the mainboard and touch sensor. Got it back with Sequoia installed.
Hey did they replace the motherboard for free or did you have to pay for the repair? I'm scared they will break my device if I try Genius bar again. I haven't been able to fix this issue no matter what I do. Thanks
 
Hey did they replace the motherboard for free or did you have to pay for the repair? I'm scared they will break my device if I try Genius bar again. I haven't been able to fix this issue no matter what I do. Thanks
I purchased my system April 5th of this year and I purchased a 3 year extended warranty. The repair was covered under the terms of the 1 year warranty. It was free.
 
I purchased my system April 5th of this year and I purchased a 3 year extended warranty. The repair was covered under the terms of the 1 year warranty. It was free.
Okay thanks for the info. I regret not buying Apple Care now. I think I'm always gonna buy Apple Care when I buy a Mac from this point forward. Lesson learned 😅
 
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