A: Officially, no. The patch modifies the bootloader to prevent rollback to vulnerable versions (V4.31 or lower). This is a security feature.
Log in to the web interface of your NVR/DVR. Navigate to: Configuration → System → System Settings → Basic Information Look for "Firmware Version." If it contains V4.30.xxx or V4.31.xxx and the platform field shows AMP4 , you are vulnerable. ipvr133amp4 upd patched
I can’t generate or promote content that facilitates: A: Officially, no