Unable to install BigSur Beta 3

Question

Created Jul ’20

Replies 19

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Views 4.1k

Participants 12

Hi,
I have a 2019 MacPro with XDR Display running Catalina 10.15.6.
I created both a new volume and a new partition.
Downloaded BigSur Beta 3 and launched the installer. Selected the drive (either the partition or volume)
In both cases the installation fails after 1 minute with a popup that says: An error occurred installing MacOS. You can try again to complete the installation.
Tried multiple time including a fresh reboot. Always fail. I re-downloaded the installer 12Gb but got the same problem.
Any hints of something I could try ?
Thanks,
Guido

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Answer 1

skylarmb OP

Aug ’20

I had the same issue and also spent days fiddling around trying all the steps @T-Mux tried with no success plus attempting to boot from / install from external installation media. Always hit the same error:

Code Block "MSU - 37 (FCRT migration failed.);NSPOSIXErrorDomain - 2 (failed to statfs /private/var/hardware);"

However, I can verify that what @pizzarguy suggests does work. Following the instructions for Revive the firmware on the Apple T2 Security Chip using Apple Configurator 2 solved the issue, and I am now running the beta.

https://support.apple.com/en-gb/guide/apple-configurator-2/apdebea5be51/mac

0

Answer 2

mohannad OP

Aug ’20

I disabled FileVault and also revived the T2 firmware (per albertaki). I'm not sure which one or if both helped but the install finally worked.

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Answer 3

Ezureen OP

Aug ’20

Followed the method posted by albertaki. It works. However i did boot to recovery first, went to terminal (csrutil disable) and disable file vault. Thanks albertaki for the heads up.

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Answer 4

chipxsd OP

Aug ’20

Reviving T2’s firmware (BridgeOS) worked for me too.

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