Updating to Windows 8.1 breaks hidden recovery partition in OEM machines.

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How to uninstall Windows 8.1

http://www.lohud.com/usatoday/article/3476743

How to uninstall Windows 8.1

http://howto.cnet.com/8301-11310_39-57610729-285/how-to-uninstall-windows-8.1/

Windows 8.1 Update Leaves OEM Owners With Broken Restore Function

http://www.technologytell.com/gadge...aves-oem-owners-with-broken-restore-function/

How to Create Recovery Media before Installing Windows 8.1

http://windowsitpro.com/windows-8/how-create-recovery-media-installing-windows-81

Update to Windows 8.1: FAQ

http://windows.microsoft.com/en-in/windows-8/upgrade-to-windows-8