To unlock your phone, you need to have the following cables: DKU-5 or CA-42
With these cables you can connect your Nokia phone with your PC via a USB port.NOTE: No other cable will work because ONLY DKU-5 & CA-42 support FBUS.
(Pop-port cables DKU-2, CA-43 & CA-52 will not work since they do not support FBUS.)

You must have the latest version of that cable driver. Download here.

Note that phones with only a USB port(N91, N93i & N95) will need to use an unlocking/flashing box. Please see this forum for more details.

Battery should be fully charged & any SIM card should be removed.
Instructions:
1. Connect your phone with cable to computer. Switch on phone.

2. Go to Device Manager, Modems, Nokia XXXX USB Modem. Right-Click and access the phones’ Properties. In the Modem tab, note down the COM port(1 to 9).

3. Unzip BB5.zip in a folder & run `install.bat`

4. Open file c:/bb5_unlocker/logs/bb5_unlocker.cfg and write here the COM port(1 to 9).

5. Run c:/bb5 unlocker/BB5logunlocker.exe

6. Click READ PHONE

7. Click MAKE LOG, log will be created in the folder LOGS. This log contains your unlock codes.

8. Enter codes to phone manually, or

9. Click SP UNLOCK to enter codes via FBUS