What is slmgr -rearam command and why we need to use it?
slmgr -rearm is use to reset your Windows license status to zero so that all your old or previous expired licenses(Product Key) connected to your system will be removed and so that a new license(Product Key) can be added for activation.
STEP -1
STEP -2
STEP -3
STEP -4
After restarting your system you can enter your Product Key and activate it.