Last Updated on August 12, 2022 by Mathew Diekhake

The Nokia Lumia 800 and 710, although fantastic devices from Windows, seem to be a tad lacking when it came to stamping out their name in the smartphone industry. Whether it was due to the increasing competition or the noticeable lack of applications on the Windows Phone platform, the Lumia series is yet to make its mark.

We do have good news though, the brilliant team at XDA Developers has just delivered the first ever custom ROM which is available on the Nokia Lumia 800 and 710 with Interlop Unlock (yay). And we have the tutorial below if you’re eager to give it a go, you will need to have an unlock bootloader before you can install the build 12070 custom ROM.

As with any tutorials, proceed at your own risk and please insure you back up your device before hand. ConsumingTech will not take any responsibility for damage to your device or any loss of data. This tutorial is recommended for users who have good knowledge of in-depth modification, it is not recommended to those with little or no experience .

You need to check if you have the unlock bootloader (AKA the Qualcomm development bootloader) before starting the tutorial. All you need to do is turn off your device and then hold down the Volume Up and the Power buttons at the same time. Wait until you feel haptic feedback then, via USB, connect your device to your PC. You will know you have the unlock bootloader if it comes up as being in ‘disk mode’ which is USB Mass Storage. Also, complete a full backup of your device.

Flash Windows Phone Custom ROM Interop Unlock Nokia Lumia 800 710

Step 1. You need to download DD which you can do HERE.

Step 2. Depending on the phone you have, either Lumia 800 or 710 you need to download the relevant custom ROM. This can be found on the XDA thread HERE.

Step 3. Connect your device to your PC with USB.

Step 4. Locate the relevant partition:

dd if=./os-new.nb of=/dev/sdX9

(X will be the detected disk from your Linux distribution)

Step 5. You need to perform a hard reset which can be done by taking the device out of disk mode by holding down the power button for 10 seconds. You will then need to hold down Volume Up plus Power plus Camera, hold these down until the phone vibrates. Whilst still holding the Volume Up and Camera buttons, release the Power button, you need to do this for roughly 5 seconds in order for the reset to be effective.

This install also comes with a Interlop Unlock which is handy for those users who want to install homebrew apps. If you had any trouble during the process, make your way over to the XDA official thread, they are generally more than happy to point you in the right direction.