Hello, i have a very strange problem: I have a HP Probook 6570b with Windows 7 Pro x64, but after upgrading to Windows 10 Pro activation is impossible (error code: key blocked). Windows 7 was activated with slic, genuine from HP, because it was sold with Windows 7 Pro. What i tried yet: -cleaninstall with genuineticket.xml: first Windows 7, activation with installing key and cert, saving the activation-ticket and cleaninstall of Windows 10: no activation possible. -another harddrive: same here..... -switched from UEFI to CSM-mode in bios, installation Win 7 with MBR, activation and upgrade to 10: no activation possible! -phone activation was never possible after upgrades, only for retail/volume licenses. I guess there is a problem with the genuineticket, regardless if it is automatically or manually build: Because the genuineticket in the C:\programdata\microsoft\windows\clipsvc\genuineticket-folder doesn't disappear after restarting. I did a few cleaninstalls with the genuineticket-trick on several computers and never had a problem with activation...... Any ideas?