If you are the rightful owner of the device, Apple provides free methods to remove the lock:
: Bypassing iCloud Activation Lock screens and MDM (Mobile Device Management) profiles. Developer : iRemove Software.
Many mirrors of iRemove Tools 1.2.8 contain:
Only words with 2 or more characters are accepted
Max 200 chars total
Space is used to split words, "" can be used to search for a whole string (not indexed search then)
AND, OR and NOT are prefix words, overruling the default operator
+/|/- equals AND, OR and NOT as operators.
All search words are converted to lowercase.
iremove tools 1.2.8 windows 7