Zidoo just released the latest FW (v1.2.20) for the Zidoo X20 unit.
In case there is still no OTA notification from the settings menu, you can manually download it and install it from here.
Installation instructions can be found here.
The changelog is the following:
System
1. Optimize Stability of
2. Fixed the problem that AV
Wall poster
1. Fixed the problem of
2. The child lock is closed
3. Set wizard to add lock
4. Optimized the main
5. Optimization when updating
6. Optimized permission
Music player
1. Fixed the problem of flash