This article provides you the way you can set the VIDEOJET decoder 8000/ 7000 (VJD-8000/ VJD-7513) to factory default.
Article requirements:
VIDEOJET decoder 8000/ 7000
Keyboard
monitor
If the ‘decoder offline’ message occurs during the FW upgrade from 54.7 to 54.8, try to use another version of Configuration Manager, or remove the password temporarily.