macOS Big Sur Beta 3 - An error occurred preparing the update

I can not update my 2019 iMac 27-inch to macOS Big Sir Beta 3. I always get at An error occurred preparing the update. Failed to personalize the software update. Please try again.

Anyone else experiencing this?

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gamebroz
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I'm experiencing the same issue on a 16" MacBook Pro.
Posted by
lezone
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same issue here! Error occurred MacBook Pro mid-2014
Posted by
elisq
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Same for me - 16" MBP
Posted by
krames
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Mee too. Try 3 times then upgrade progress has been done (although taking long time), but my Macbook is still in beta2 version.
Posted by
hoang vufromhanoi
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same for MacBook Air 13-inch, 2018
Posted by
dostanko
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Yea same on Macbook Air 13" mid-2013.
Posted by
salesmartian
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here the same with MacBook Pro 13 2020, any hint would be highly appreciated.
Posted by
mafoe71
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Software Update Tool



Finding available software

2020-08-03 08:28:31.504 softwareupdate[3628:137230] Creating client/daemon connection: 8DBD86DD-D6EF-40C5-9E6F-2FCF8162DACC

Downloading macOS Big Sur Beta 3

downloading: 100.00%

Failed to download & prepare update: Error Domain=SUMacControllerError Code=7722 "[SUMacControllerErrorPreflightPrerequisiteCheckFailed=7722] Failed to perform PreflightPrerequisite operation: com.apple.MobileSoftwareUpdate.preflight.error(Preflight):MSUPreflightErrorTargetIsNotSnapshotBooted(6) | The volume can not be used because it is not snapshot booted.

  • > Current device configuration requires an alternate installer to perform the update.: [com.apple.MobileSoftwareUpdate.preflight.error(Preflight):MSUPreflightErrorTargetIsNotSnapshotBooted(6)|Unknown Error Indication|]" UserInfo={SUMacControllerErrorIndicationsSummary=|Unknown Error Indication|, SUMacControllerErrorIndicationsMask=8, SUMacControllerErrorIndicationsDescription=-> Current device configuration requires an alternate installer to perform the update., NSUnderlyingError=0x7fc8dd419ba0 {Error Domain=com.apple.MobileSoftwareUpdate.preflight.error Code=6 "The volume can not be used because it is not snapshot booted." UserInfo={NSLocalizedDescription=The volume can not be used because it is not snapshot booted., NSLocalizedFailureReason=The volume can not be used because it is not snapshot booted., MSUPreflightAlternateInstallerRecommended=true}}, NSDebugDescription=[SUMacControllerErrorPreflightPrerequisiteCheckFailed=7722] Failed to perform PreflightPrerequisite operation: com.apple.MobileSoftwareUpdate.preflight.error(Preflight):MSUPreflightErrorTargetIsNotSnapshotBooted(6) | The volume can not be used because it is not snapshot booted.

  • > Current device configuration requires an alternate installer to perform the update.: [com.apple.MobileSoftwareUpdate.preflight.error(Preflight):MSUPreflightErrorTargetIsNotSnapshotBooted(6)|Unknown Error Indication|], NSLocalizedDescription=Current device configuration and target is invalid for install in the current state. Please try again.}

Posted by
mafoe71
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Same issue here on my Mac Mini. Anyone get around this issue?
Posted by
RoarinRow
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I also got this error when I try to update my DTK to macOS Big Sur Beta 4.
Posted by
Mizuna
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yea same with iMac end 2013
Posted by
daarin
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Any fix for this? MBP 2018 T2 same issue
Posted by
luisanthonypr
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Some people are reporting success after reviving BridgeOS on the T2 security chip by using Apple Configurator 2 on a second computer. See https://developer.apple.com/forums/thread/656059
Posted by
robzr
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Same problem with MacBook Pro mid-2014
Posted by
audiojan
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I'm experiencing the same on a MacBook Pro 15" Mid 2014 when trying to upgrade from beta 4 to 5.
Posted by
zydeco
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