How to confirm a recorders firmware code:
Login to the recorder and navigate to "Settings > System > Information", next to "about this machine" click "View". The firmware code is shown in the firmware version number as highlighted here:

| NVR Model | Firmware Code | Version/Download | Notes |
|---|---|---|---|
VIPER-NVR-4K-4 | N0L | 1.4.11 | Release 74500 |
VIPDL-NVR-AI4-32 | N0W | 1.4.14 | Release 88630 |
VIPER-NVR-4K2-4 | N0Z | 1.4.14 | Release 86766 |
VIPER-NVR-6MP-4 | N3V | 1.4.14 | Release 87071 |
VIPER-NVR-AI2-8 | N0R | 1.4.12 | Release 82058 |
| VIPER-NVR-AI3-8 | N0A | 1.4.14 | Release 86766 |
VIPER-NVR-AI-32(V1) | N4I | 1.4.12 | Release 82058 |
VIPER-NVR-AI-8 | N0N | 1.4.12 | Release 82058 |
| VIPER-NVR-DL-4K-8 | N2P | 1.4.12 | Release 84683 |
| VIPDL-NVR-AI-64 | N5I | 1.4.3 | Release 66596: supported, version number 1.4.3 does not reflect feature set |
| VIPER-NVR-AI8-N-32 | N2I | 1.4.12 | Release 82058 |
VIPDL-NVR-AI2-64 | N0Y | 1.4.14 | Release 87287 |
| VIPER-NVR-AI8-N2-32 | N1W | 1.4.14 | Release 87611 |
VIPER-NVR-32 | N0I | 1.4.6 | Final Release 56610: End of Support |
VIPER-NVR-4 | N0K | 1.4.4 | Final Release 42665: End of Support |


