Manufacturer

Code did not work???
Make sure it is not user password
Hard reset to clear it

Codes did not work
Enter code slowly and exactly

90% IMEI was not correct, please dial *#06# to make sure
DO NOT GET IMEI FROM BACK OF PHONE
(MAYBE NOT MATCH, SO IMEI IS NOT CORRECT AND CODE WILL NOT WORK)


If the IMEI was correct but the phone did not accept unlock code
9% your phone was not in stock Rom
Restore your phone back to stock Rom code will work

If the IMEI was correct and you entered code exactly and phone was in stock Rom but the phone did not accept code
1% Your phone in the un-supported list below

Make video of proof to get refund
if IMEI was correcct
and phone in stock Rom
and phone was not in un-supported list below