"Reversing​" Windows 8.1 Pro 64 Downgrade Windows 7 Profession​al 64

I just received my new Thinkpad X240 with Windows "downgraded" to Windows 7 Professional 64, as I requested. However I have now changed my mind, and would like Windows 8.1. Can I do the upgrade myself with the media provided? Thanks for any pointers.
(PS the reason I decded to go for W8 is that I understand W7 does not do full HD encrpytion included in the price, so I need the Bitlocker bundled with W8) 

Bitlocker was only available in the Windows 7 Ultimate and Enterprise edition.
As for the downgrade, it depends. Look on the bottom of your computer. Is there a Windows 7 COA sticker? If there is, you just bought a computer with Windows 7.
I have not tried doing this, so I am not sure how well it works, Take a look here, https://forums.lenovo.com/t5/Windows-8-and-8-1-Kno​wledge-Base/How-to-find-the-product-key-on-a-prein​...
If you have a windows 8 key, you might try doing a factory restore and see if that restores Windows 8 or windows 7.
You might also want to look at your paperwork for when you purchased the computer. If you paid for Windows 8 and Windows 7 then you should be able to get the recovery discs from Lenovo. But chances are you only got Windows 7 and looking for the windows 8 key will fail. In which case the only way to get windows 8.1 is to buy a new copy.
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

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