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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.
They used a Chip from 2018, So It was already "old" when they released the phone in 2020.
Not making excuses for them and Qualcomm are equally as shit because they just drop support so quickly.
I am aware of other chips that are supported longer than it.