VIEWSONIC EBOOK VS13394 - Manual (Page 45)

ViewSonic VEB620_VEB625 
Firmware Upgrade
By downloading and installing the system firmware update will
upgrade your eBook’s firmware and software to the latest version.
This will improve your eBook’s operational performance, fix
software bugs, repair software errors and add more features and
more value to your eBook!
please check our online web page (www.viewsonic.com) from time
to time for system firmware update: