Official policy from EZVIZ Support states that firmware downgrades are not supported
This desktop application allows for more "Advanced" configuration than the mobile app. Firmware File (.dav):
The most reliable free method involves unlocking hidden "Advanced" settings in the software. This is not available in the standard mobile app.
: Locate the 6-digit capital letter code on the white sticker of your camera.
What are you trying to get back (e.g., RTSP, local storage)? Are you comfortable editing configuration files on a PC? Downgrading an EZViz CS-CV216-A0-31EFR IP Camera -