Problem solved!
A factory reset is performed by reloading (at least) the system file: MOI2921_fs.bin, all settings will be reset to initial.
1. Download MOI2921_fs.bin) from:
http://www.tbsdtv.com/download/;2. Copy MOI2921_fs.bin to a USB flash drive;
3. Make sure your MOI+ is powered off, connect the USB flash drive to it, and then power on, the update will start, on the LCD screen it displays:
- "Welcome MOI+"
- when updating the system, it shows the system loading progress in percentage (%) and "Reading, please later...";
4. After the update completes, the IP address will be displayed on the LCD screen (make sure the network cable is connected).