Hello, JUN-CON.
Welcome to Microsoft Community!
The Surface Duo 2 has a Widevine DRM level of L3, which does prevent the device from HD (1080p) streaming on streaming services like Netflix. In contrast, the Surface Duo 1 has L1 level certification, so it can support HD streaming.
If you need to upgrade its Widevine DRM level, the most effective way to do so is to upgrade the driver and firmware updates. However, this feature is not currently in the update program for the Surface Duo 2.
I think this level upgrade is very necessary for Surface Duo 2 users, which will enhance our experience. So please let's all voice this opinion through the Feedback Hub **** you can send your feedback link here and I will vote for you.
Thank you for sharing your thoughts on this issue, your input will be valuable to the advancement of Surface products.
Best Regards.
Leo.L - Microsoft Community Support Specialist