1. Please trouble shoot as usual with the customer, the code must be correct and the phone MUST prompt for the code.
2. If nothing we can proceed to use the “release method” on the phone(s):
a. Go to the Dial pad and dial *#197328640#
b. Please click on number
1) Debug screan
8) Phone control
4) Network Lock
c. You will see 3 options
d. Please click on number
e. Please hit the MENU button then when the menu pops up please carefully hit BACK to return to the previous screen
f. Please click on number  Perso Sha256 ON, the screen will change again to a one line message
g. Restart the phone on the screen by holding the power button and click RESTART
h. When the phone prompts for the unlock code simply enter the unlock code
i. Your phone is now permanently unlocked!