SHA256_ENABLED_FLAG[1]
SHA256_OFF => SHA256_ON
Select the first line. Select SHA256_ENABLED_FLAG[1]. The phone will display:
MENU NOT EXIST
PRESS BACK KEY
To continue, press the Menu button on the phone and select Back.
Make sure to change the correct settings. When backing up, the message in Step 4 will appear:
SHA256_ENABLED_FLAG[0]
SHA256_OFF => Not Change
Return to the UMTS menu. Press the menu button and select Back in the UMTS Main menu. Select [6] COMMON and select [6] NV REBUILD. The screen will display the message:
Golden-Backup exists
You can Restore Cal/NV
Restore backup. In the NV REBUILD menu, select [4] Restore Back-up. The phone will automatically reboot. The phone will be unlocked in this step. You can insert a SIM from another network to use the new service.
Find the IMEI number. You can dial *#06# to see the IMEI number. You can find the IMEI number printed on the battery tray after removing the battery. IMEI number has 15 digits.
Visit the free unlock website. Nokia phones are one of the few that can be unlocked using a code generated online. There are many websites that offer free unlock codes. You need to know.
Enter phone information. Enter IMEI number, phone model, country service, and network operator. This website will generate the specified unlock code for your phone.
You can check your phone model by dialing *#0000#
Enter the unlock code. To enter the newly created unlock code, insert another carrier's SIM into the device. The phone will ask you to enter a code.