I lost audio completely when I was messing with hi13 as my Bluetooth headphones had audio lag. I reset windows 10, you can do it from recovery options or settings.
You will lose installed programs but your files would keep intact of you choose so.
If nothing helps, I will restore the factory 1607 installation. But then I would have to install all the updates since last year. This was the reason why I installed a clean (much to clean) Windows 1703.
I installed a clean copy of Windows and lost driver support for my touchscreen, audio, camera, and pen. I found the drivers supplied on this website, and would like to find a solution that doesn’t just reset via factory CHUWI image.