upgrade unsupported Lumia to redstone 3 [1709]

Hey there! If you have an old Windows phone lying around or if you're still using a Windows phone and want to get the latest w10 build 1709 on a Lumia Windows phone that's no longer supported for updates, just follow these steps to upgrade.

First, download the interop tools from here

No need to worry about registry providers with these interop tools. Just use the "this device" option during app setup. Make sure you have development mode enabled on your Lumia.

Next, go to the "registry browser" and make the following edits:

- HKLM\SYSTEM\Platform\DeviceTargetingInfo
    - PhoneModelName: Lumia 950 XL

- HKLM\System\Platform\DeviceTargetingInfo
    - PhoneHardwareVariant: RM-1085

- HKLM\Platform\Platform\DeviceTargetingInfo
    - PhoneManufacturerModelName: RM-1085_15217

Once you've made the edits, go ahead and check for updates. That's it!

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