Procedure:
1. Dial the following keys *#197328640#.
2. Go to UMTS, DEBUG SCREEN, PHONE CONTROL, NETWORK LOCK, and OPTIONS.
3. Select ‘Perso SHA256 OFF’ then wait for 30 seconds.
4. Then go back by pressing the MENU button then select BACK, select NETWORK LOCK, and then choose ‘NW Lock NV Data INITIALLIZ’.
5. Wait for a minute then REBOOT your phone. Done.
To test, just insert a sim card from a different carrier/provider.
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