: Because firmware is specific to hardware revisions (like the V2), it is often recommended to contact CP PLUS Support directly with your model number to receive the correct, latest stable version. Prepare for Update :
The V2 model uses a different chipset. Always look for the exact “-V2” suffix. Mixing them will brick the NVR. cp-unr-4k2161-v2 firmware download
Technically yes, through the same USB method, but it is not recommended. Downgrading can cause configuration corruption or boot loops. : Because firmware is specific to hardware revisions