VI10 latest WIN8.1 system firmware download : https://www.dropbox.com/sh/i5uat1gr2slw9we/AAAfaGYgG5ch6AeklYYVFpmEa?dl=0
the image file is large so that it is divided into 2 zip files. when the first zip and the second zip are downloaded, it needs to be unzipped simultaneously.
Close the antivirus software before unzipping the image files to avoid the apps in files are deleted.
Flash windows have risk, please follow the tutorial