Windows 10: Upgrade to 20H2 from 1909 on a MacBook Pro 2015 15" fails constantly

Hello,last year, Windows 10 tries to update to 2004 and now to 20H2. The update freezes constantly at 48 %.From Get help with Windows 10 upgrade and installation errors microsoft.com:Make sure that your device has enough space: I have enough free spaceRun Windows Update a few times: doneCheck third-party drivers and download any updates: I removed all apple related driversUnplug extra hardware: nothing is plugged inCheck Device Manager for errors: the device manager is cleanRemove third-party security software: never had oneRepair hard-drive errors: no errorsDo a clean restart into Wind

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Windows on Macbook Pro using Bootcamp

Hi,

You need support software (drivers) installed with Boot Camp to use Windows 10. This software is automatically downloaded when you use Boot Camp Assistant. Boot Camp supports 64-bit versions of Windows 10 Home and Windows 10 Pro when used with a supported
Mac. Here are the list that supports Windows 10:

• MacBook Pro (2012 and later)
• MacBook Air (2012 and later)
• MacBook (2015 and later)
• iMac Pro (2017)iMac (2012 and later)
• Mac mini (2012 and later)
• Mac mini Server (Late 2012)
• Mac Pro (Late 2013)

We also suggest that you check and follow the steps shared by Andre Da Costa on this
thread on how to setup Windows 10 on your Mac using Boot Camp.

Let us know if you need further assistance.

 

Upgrade to 20H2 failed

The laptop was offered the feature upgrade to Win 10 20H2. It is still running 1903. It had failed 1909, 2004 with this error 0x80004005 - 0x1000A,The installation failed in the DOWNLEVEL phase with an error during PREPARE_FIRST_BOOT operation.

Since Microsoft does not like this laptop anymore I had done a chkdsk, a SFC / scannow and a disk error check from the properties tab. All errors fixed.

I stopped MS secutity, firewall and the Avast security for the upgrade.

Downloading and installing took some time and it looked as if the laptop was going through the motions. At the end it had just reverted to 1903 again.

What else can I do short of a complete reset?

 

Upgrade from 1909 to 20H2

When upgrading you can install 1607 and upgrade to 20H2.
So upgrade from 1909 to 20H2 with the upgrade assistant.

If there is success then that will complete the thread.
If the upgrade fails then record the error message and code for troubleshooting.