remove icloud from ipad2
About a year ago my business bought an ipad2 and another employee set up the icloud account under his own account.
Fast forward to now and he no longer works here and I am tasked to remove his icloud account. I already restored and updated using the latest ios version. However its still activated to his account. He says he doesnt remember.
How can I remove his icloud account and put on the store one I created?
iPad 2, iOS 8.1.2