Satellite C850-B559: win 8 for Win 7 downgrade KMS server activation has failed

Hello

I have toshiba Satellite C850-B559 windows operating system 8
I try to downgrade to Windows 8 for 64-bit Windows 7 Enterprize.
It works well but faild KMS server activation!

can you help me find the problem?

Hello

Your purchased Windows 7 from Microsoft?
The serial key is provided by Microsoft. Is - is this right?

Tags: Toshiba

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