When you disable it, the drive essentially locks and no data at all (including the partition table) will be accessible to legacy boot devices (that is a security function of Secureboot so that you cannot just boot an older or live OS and steal all the data from a secured drive). Secureboot intentionally creates a known-good startup process from POST to completing startup into the OS. It might be a bit of a hassle, but that would be the correct resolution to it not activating correctly is that if it did not originally install with 8.1, you should not attempt to install 8.1 until after it activates (and only then by the prescribed upgrade procedure from Microsoft) unless you are willing to use a new key to directly install 8.1.Īs for the direct-installation giving you issues, Secureboot is what is causing your troubles. it is considered by Microsoft to be a different OS than Windows 8, so a key for Windows 8 will only activate Windows 8 (even if you can upgrade it to 8.1 for free) because they are technically different OSs in the same family. 8.1 may essentially be more or less a service pack for Windows 8. then you will have to install 8.0 for the device to successfully activate (and then install the upgrade to Windows 8.1). Joe is correct, however if you are attempting to install 8.1 and the original load is 8.0.
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