You can install Windows 11 on the Surface Duo if you own a Microsoft device. Gustave Monce, an engineering student, has been working on getting Windows 11 on the Surface Duo for months, and he has now posted a guide to dual-boot Windows and Android on the original Surface Duo.
You will need a 128GB variant of the Surface Duo to install Windows 11 on the ARM platform. If you want to use Windows 11 as your daily driver, be prepared for almost nothing to work. Touch controls, networking, cellular data, and the cameras are all non-functional while Windows 11 boots on the Surface Duo. This experiment is only for people who want to play with Windows and the Duo.
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— Simone Franco (@Simizfo) March 10, 2022
You will have to use a PC to boot Windows when you need it.
This is an early preview, but it's impressive that a developer was able to get Windows 11 on a Surface Duo. Monce has worked hard to get full versions of Windows running on devices that don't support it. He was able to get Windows 11 running on a Windows Phone last year, and the OS adapted well on the 5.7-inch display.
The full guide for experimenting with Windows 11 on a Surface Duo is available here. Proceed at your own risk because this will likely void your warranty and you could brick your Surface Duo.