Vivo has tightened security. The 7.4.4.0 update scans .vth (Vivo Theme) files for malware or intrusive adware before installation. If a theme attempts to change browser shortcuts or inject pop-up ads, the installation is blocked with a clear warning pop-up.
Users and developers have reported several key changes in this update. Here are the most notable highlights: vivo themes 7.4.4.0
The theme was designed for an older version of Funtouch OS or OriginOS. Fix: Report the theme via the "Feedback" button. In the meantime, use the "Compatibility Mode" toggle found under Theme Settings > Advanced. This strips out unsupported UI elements. Vivo has tightened security