I started from OEM 8.1 Pro activated upgraded to win 10 pro, it stayed activated, so far so good... But I decided it was time to do a reset...and I lost my activation after the reset Phone activation refused my ID, the guy at the phone told me to reinstall 8.1 and do the upgrade process again But I tried another thing: clean install win 10 from usb I deleted every partition on my pc, started from a clean disk and skipped every key request during the setup guess what? I'm again activated not a fishy mak key, not an oem key, but it says retail Do you think I can stay safe? or should I do the upgrade process again? Should I check something to understand if it's a legit activation or some kind of error?