This is what you need to flash the NB0 firmware by using the SUT (Software Update Tool) version L3.
It’s important that the Android device you want to update doesn’t run out of battery power during the update and even though you may be connecting to a computer, you still need to make sure it has some juice before you go ahead with the flashing. We recommend that you make sure your battery is at least 75% changed before you go ahead with any update, so the battery is never an issue.
How to Use SUT L3 Tool to Flash NB0 Firmware
1. Start by downloading the Software Update Tool to your computer and then extract the file by right-clicking > selecting “Extract” from the menu. (“L3” is the version of the Software Update Tool, so make sure you download the right one from the list on the download page.)
2. Your computer may prompt you to install .net framework on the computer before the installation is complete. Follow the guidelines to get that done if it asks you for it.
3. Follow the SUT setup wizard found in the extracted folder.
4. Turn off the Android smartphone by holding in the Power button until the device turns off.
5. Source the firmware file that you’re looking to flash and then download the file onto your computer.
6. Once the firmware is extracted and ready to install, open the SUT L3 Tool and then click on the “Next” button from its main interface.
7. Click on the dots next to where it says “Please select the software image file” and then browse through your computers hard drive to the location of the firmware that you extracted earlier and upload it to this location in the flashing tool.
8. Once you’ve successfully uploaded the firmware, you’ll see the firmware extension path in the box.
9. Now click on the drop’down menu where it says “None” and select the “Enable Emergency Download Process” option from the list instead.
10. With the Android device still turned off connect it to the computer with its USB cable and then click on the “Next” button from the SUT interface.
11. You should now see a message on the flash tool’s interface letting you know that it is “loading the image files….”
12. This now means that the firmware is getting flashed to your device. Once you can see the green tick, you know that the flashing is complete and your device is ready to disconnect from the computer.
Your new stock firmware should now be installed and ready to use.
[*] Back Up Your Data: You should always back up your data before you begin flashing new firmware files to your smartphone or tablet. All of your pictures, music, videos, documents, etc. should be still on your device after you have updated the firmware, but you may need to restore the contacts and applications from a backup.
[*] Wipe Cache and Factory Reset: Some people claim that taking a factory reset isn’t necessary after updates, but at the very least you should wipe the system cache after installing new firmware. This way you can help eliminate any performance issues and battery draining bugs. Taking a factory reset is the best way of avoiding common problems many users face after applying software updates.