How to use Online Service Tool (OST)

In this post, are the instructions on How to use Online Service Tool (OST) to flash or install .nb0 or .mlf Firmware on Nokia Devices.

How to use Online Service Tool (OST)

Caution: Installing or Flashing Firmware using the OST Tool may wipe the personal data from the device. Therefore, we recommend you to choose the Update Option carefully in Step#13.

Install .nb0 or .mlf Firmware using OST Tool

1. Download Stock Firmware (ROM) of your Nokia Device (if in case you have already downloaded the stock firmware, then SKIP this step, or else you can find the Nokia Stock Firmware on our Nokia Firmware Category).


2. Now, Extract OST Tool on your Computer (assuming you have already downloaded the tool; if not make sure to Download OST Tool). Once downloaded and gotten the tool extracted, you will be able to see the following files:

3. Open Launcher.exe to begin the installation process.

4. Now, Click on Next Button:

How to use Online Service Tool (OST)

5. Again, Click on Next Button to Confirm the Installation:

How to use Online Service Tool (OST)

6. Click on Close Button, to Exit the Setup.

How to use Online Service Tool (OST)

7. Now, Copy OnlineUpdateTool.exe:

How to use Online Service Tool (OST)

8. Paste it to the OST Installation Folder (C:\Program Files (x86)\OST LA):

How to use Online Service Tool (OST)

Click on Replace to Confirm:

9. Open OST Tool (you can open it through the Start Menu Shortcut or directly from the C:\Program Files (x86)\OST LA Folder).

OST Launch

10. Once OST Tool is launched, you will be able to See the Following Screen:

11. Now, Click on the Next Button:

12. Click on the Browse Button and Locate the Stock Firmware of your Device (which you have downloaded in Step#1):

13. Click on Update Option Menu there you will see multiple Options. The Normal Download will help you to install Stock Firmware on Working Device (without wiping personal data) and the Emergency Download option helps you to install the firmware on Dead Device (will wipe personal data).

Since we are using a dead phone, therefore, We have Selected the Emergency Download Option:

14. Now, Connect your Nokia Device to the Computer (make sure device is Power Off):

Mobile Connected Computer

15. Click on the Next Button:

16. Now, OST will begin the installation process (which may take couple minutes to complete):

17. Once the installation process is completed, you will be able to see the Download is Succeed Message at the End.

18. Now, Close the OST Tool by Clicking on the Finish Button and Disconnect your Device from the Computer.

Congratulation! Now, Restart your Mobile Device, and you’re ready to use it.

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[*] Caution: Flashing or installing Firmware using the OST Tool (in Emergency Mode) will wipe out your Personal Data from the device. Therefore, take a backup before using the Tool to install the Firmware on your Nokia Device.

[*] Nokia Stock Firmware: If you are looking for the Original Stock Firmware then head over to the Download Nokia Stock Firmware page.

[*] Nokia USB Driver: If you are looking for the original Nokia USB Driver, then head over to the Nokia Driver page.

[*] Credits: OST Tool is created and distributed by HMD Global Oy. So, full credit goes to them for sharing the Application for free.

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