Windows 10/11 Upgrade Error

“We couldn't update the system reserved partition” issue. Try below fix.

1.        Go to Disk Management and find the System Reserved (or DATA partition if Migration cloned it) right click on it and go to change drive letters and paths -> add -> now choose Y: for the drive letter.

2.        Right click the CMD.EXE start menu icon and choose 'Run as Administrator'.

3.        Type: Y: then press <enter> in the cmd window.

4.        Run these commands (copy and paste them is easier then typing them):

takeown /f . /r /d y

icacls . /grant administrators:F /t

attrib -h -s -r bootmgr

5.        Now open explorer (win+e) go to the Y: drive under computer, Make sure hidden files and system files are visible through folder options. Then go into the Boot folder, and delete all languages other than en-US. Languages are in the form xx-XX. Make sure to shift+delete and not just delete so they don't go to the recycle bin. Empty the recycle bin afterwards just in case.

6.        Now go back to the admin command prompt, and type this command:

Windows 7: chkdsk Y: /F /X /L:5000
Windows 8 or 8.1: chkdsk Y: /F /X /sdcleanup /L:5000

7.        This truncates the NTFS log to 5MB, it can be very very big, not leaving enough space for the install. At the end of the output it should tell you that you have at least 50MB of free space on the partition

8.        Proceed with the Windows 10 upgrade 

9.        Once booted into 10 and set up is completed, you can go back into diskmgmt.msc and remove the drive letter for the System Reserved partition.