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Nokia Lumia 520

Nokia Cable Unlocking Service

Step 1: Download Nokia SL3 Unlocking Server Software

Download the Nokia SL3 Unlocking Server software: SL3_Unlocker.zip, You don't need to install this software.
Unzip the file to your desktop ( or somewhere ) and leave for now.
Download and install the Nokia USB drivers from here: Nokia_Connectivity_Cable_Driver_7.1.69.0.zip
Note: Wait until the Nokia USB drivers are completely installed.
Once complete, reboot your PC then proceed to step 2.

Step 2: Checking the Drivers are installed and your Mobile is connected to the server.

Remove the SIM card and any memory cards from your phone.
Turn the phone on and Connect it to your PC using a standard USB cable.
When the phone starts, make sure you select PC Suite or Ovi if prompted.
The phone may ask to start without a SIM card, click 'Accept'.
Allow windows to install all drivers automatically
It's important to wait until all the drivers have finished installing.
Next, run the Sl3Logger.exe program previously extracted to your desktop.
Press the CHECK PHONE button to confirm the phone is connected to the server.
Enter your Username and Password and press the CHECK USER button.
( Please go careful when copying & pasting, you may grab extra characters )
Make sure credits have been assigned.
Proceed to step 3.

The Nokia SL3 'Unlocker' when Connected.
SL3 Connected

Step 3: Unlocking Part 1 ( Sending & Waiting )

Disconnect your phone from the PC and turn it off.
Next, press the SEND IMEI TO SERVER button and follow the software's instructions.
The software will confirm when it's been sent.
That's it for now, please wait while we calculate your unlocking code.
This process can take up to 6 hours to complete, depending on work load.
We suggest: after an hour do step 4, if not ready wait the full 6 hours .

Step 4: Unlocking Part 2 ( Unlocking the Phone )

Turn on your phone without a SIM or memory card.
Connect your phone to the PC using the USB cable.
Making sure to select PC Suite or Ovi if asked.
If they're needed, please let the drivers install automatically.
Finally, press the CHECK/UNLOCK button.
If it's ready, your phone will be automatically unlocked - The process is complete.
But if it's not ready yet, please wait a while and click again.

The Nokia SL3 'Unlocker' when completed.
SL3 Unlocker Completed