J
Jericho_2004
i upgrade my windows 8 to windows 10 ,when the installation is complete , i got problem ,my screen change to black screen when booting, and i decide to rollback to windows 8 ,since i finish rollback my windows, windows activation cannot be activated ,when i enter my product key ,i get error code 0x80070424 and 0x8007007B. HELP ME PLEASE
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