OST Tool (Online Service Tool) is a small application for Windows Computer, which allows you to Flash or install the Stock Firmware (ROM) on Nokia Mobile Devices.
Here on this page, we have shared the latest version of the OST Tool and the previous versions.
Features of OST Tool
Installer & Portable Application:
It comes as an Installer Application, as well as a Portable Application. The installer version automatically installs the supported USB Drivers on the Computer. Whereas, Portable Application doesn’t come with USB Drivers.
It helps you to flash or install the Stock Firmware on Nokia Devices. All you need to have the correct firmware (ROM) of your Nokia Device > Install the Nokia Driver > launch the Tool > Click on browse Button > Locate the .nb0 file from the firmware folder > Click on Next to Start the Flashing process.
Support Nokia Devices:
It comes in support of the Nokia Mobile Devices. Once you have installed the correct Nokia Drivers on the computer, OST can easily detect the connected Nokia Device and get ready to flash or install the Firmware on the device.
Support .nb0 and .mlf Format:
It supports flashing or installing the .nb0 and .mlf based stock firmware on the Nokia Mobile Devices. You can easily find the .nb0 or .mlf file in the Stock Firmware of your Nokia Device released by the Company.
Download OST Tool
OST Tool is compatible with all version of Windows OS, including Windows XP to Windows 10 (x32 or x64 bit). If in case you were looking for the latest version of the OST Tool, then use the following links to get it on your computer:
v6.0.4: OST_v6.0.4.zip (tested)
v6.1.2: OST_v6.1.2.zip (tested)
v6.1.8: OST_v6.1.8.zip (tested)
v6.2.8: OST_v6.2.8.zip (tested)
v6.3.7: OST_v6.3.7.zip – Latest
 How to Use: If you want to learn to use the tool to flash the stock firmware, then head over to How to use OST Tool page.
 Alternative Tool: SUTL3 Tool is the best alternative, which also allows you to Flash or installs .nb0 firmware on Mobile Devices.
 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.