I managed to restore my Chuwi Hi10 Air.
I downloaded these 4 drivers: windows RS6 (mediafire.com)
I used 7-zip to extract them. When all the drivers are in the same folder, it is enough to start extracting part 1, it will automatically extract the other parts as well. Then I followed these instructions: [Hi10 Air] [Tutorial] How to reinstall Windows 10 for Chuwi Hi10 Air - Download&Tutorial - CHUWI | Official Forum