Hello Sifu...

recently i change motherboard few times due to incompatible issue. during the changes, i activated windows 10 key few times. After third time change motherboard, my win 10 activation cant activate using the same key. I purchase win 10 keys long time ago. is there any time limit change of hardware for win 10 activation?

just one device set per key

If retail should have no limitation but oem is restricted.

refer to microsoft site they allow. Microsoft

of coz i device one key, but activation after change of hardware is allowed. but need to know is there any limitation?

no wonder...so i got limitation after few changes of hardware.. mine using OEM. thank you bro.

I changed CPUs and still fine with existing license.

If so confusing just get new license and its cheap.