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Microsoft cuts ties with the Surface Duo after just 2 Android version updates
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
I'm no expert but I imagine that with a device like this, which will no doubt be popular amongst techie-types, there'll be a custom ROM out for it soon enough
There's a very grassroots Windows 10 ARM hack for the SD1, actually. It's quirky, and lacks a LOAD of the driver blob that comes in a normal x64 install of Windows on AMD or Intel, but it can make outbound calls and run simple WinonARM apps.
That's cool if you're into Windows, but Linux or even Lineage OS should be able to run on it.