Here is a verified "firmware download work" list based on community testing:
| Brand | Model | Chipset Ver | H.264 Support | H.265 Support | Working FW Version |
| :--- | :--- | :--- | :--- | :--- | :--- |
| Annke | D41BB | v402r11 V3.2 | Yes | Yes | V3.2.15_210430 |
| Zosi | H10-16 | v402r11 V2.0 | Yes | No | V2.0.8_H264 |
| Night Owl | WNVR-8 | v402r11 V4.0 | Yes | Yes | V4.0.22_H265 |
| SV3C | XVR-08A | v402r11 V3.1 | Yes | Partial (2K only) | V3.1.03_2022 |
| Generic | 4CH 5MP | v402r11 V5.0 | Yes | Yes (H.265+) | GM8135_V5.0 |
Note: If your brand is not listed, open the device. Look for a white sticker: "PCB: V402R11-4CH-V5.1". Search Google for that exact string.
Do not skip this section. A failed flash will brick your recorder. v402r11 h264 h265 dvr nvr firmware download work
The v402r11 chip is now considered legacy (2020–2025 vintage). However, a well-tuned unit can last another 3 years.
When searching for "h264 h265 dvr nvr firmware download," you’ll notice one critical issue: Backward compatibility.
The Golden Rule: Always confirm the hardware revision printed on your DVR/NVR’s motherboard (e.g., V402R11 V2.0 vs V3.0). Version 2.0 often requires H.264-only builds; version 3.0 supports hybrid. Here is a verified "firmware download work" list
After a successful installation, you must reconfigure the codec settings.
Step 1 – Reset to Factory Defaults
Step 2 – Choose Your Stream: | Camera Type | Recommended Codec | Bitrate | | :--- | :--- | :--- | | Old Analog (960H) | H.264 | 512 Kbps | | 2MP TVI Camera | H.265 | 1024 Kbps | | 4K IP Camera | H.265+ | 2048 Kbps | Do not skip this section
Step 3 – Enable Main Stream & Sub Stream
Step 4 – Test Recording
Go to Search > Playback. If the video shows ? or "Codec missing," reflash the firmware.