I have the same problem and its nice to ask for a screenshot etc etc etc but when the phone is locked you can't make any screenshot at all sooooo........ seems that many ppl have this problem and all have the same problem they can't make a screenshot!!
The password i entered initially exceeded the 4-6 character requirement...so i kept putting in a long password and it kept coming up as incorrect. Try inputting the first 6 characters of the password which you provided AVG with if its longer than six characters. It unlocked fine. Hope this was helpful