How can I go back to Windows 8.1?

Hi!
I have Lenovo miix2 8" tablet, delivered with Wind​ows 8.1. I installed the Windows 10 Technical Prev​iew on it but I want to go back to the Windows 8.1. However, the installation does not start not the recovery part of hard disk nor USB driver that I have done from the recovery partition. The only build available is the Windows 10 Preview.
I tried install Windows 8.1 from separate USB media what I used to use installing Windows to my desktop and laptop computers and it works well. It asks product key and I downloaded an utility program "RWEverything" from http://rweverything.com/ and it shows at tab "MSDM" of "ACPI" table a character serie that seems to be Windows ProductKey. The installation program says it is no valid key and the installation is interrupted. How can I find the correct Product key?
What will be happened if I format the Windows 10 Preview partition, will the installation procedure starts from the recovery partition then?

The best way to revert your device back to factory default Win81 is to obtain Lenovo USB Recovery for your device, boot from that and proceed with recovery. This would deploy Win81 image in form originally bundled by Lenovo, including all relevant drivers and apps. See other thread where Recovery Image discussed.

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