Accidentally install windows 2012R2 on windows 8.1 partition

Hi all,

I have disk 0 for windows 8.1 and disk 1using windows 2012R2.
by mistake, I install windows 2012R2 on disk 0, which I ended up with 2 partition with windows 2012.
since I am still having the windows.old in disk 0, can I roll it back to Windows 8.1 ?


I didn't find the right solution from the internet.


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