Apparently, the feature called Filter Keys caused the problem with keyboard to some Surface Pro Users. So logically, to solve the problem, you need to disable this feature, and the issue should be solved. Here’s what users who found the solution said on Microsoft’s forums: If you already know how to turn off this feature, just do it. However, if you’re not sure how to turn the Filter Keys option off, follow these steps: There you go, according user who reported it, turning off this feature should fix the problem. So, if you encountered keyboard issues upon installing the Anniversary Update on your Surface Pro 3 device, try with this solution. Unfortunately, the Anniversary Update caused a lot of problems on the huge variety of Windows 10 devices. Although issues mainly occurred on PC, users of devices such as Surface Pro 3 and Surface Pro 4 also encountered issues on their own. In case you have any comments, or questions, just let us know in the comments. RELATED STORIES YOU NEED TO CHECK OUT: 

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