For XMeye-compatible boards, check the Xiongmai Download Center for "AHD DVR" updates. 🛠️ How to Update (USB Method)
The DVR will reboot automatically. Do not power off during this process, or the device may become unusable. ⚠️ Important Safety Tips Download Firmware DVR DHUA 7004AHD (AVR8283 rar
A common source for V4.02 generic AHD DVR firmware. For XMeye-compatible boards
Use a drive 32GB or smaller, formatted to FAT32 . Download Firmware DVR DHUA 7004AHD (AVR8283 rar
If your device is a Dahua-branded unit, use their official firmware search tool.
If you can tell me the or the Hardware ID found in your DVR's "Version" menu, I can help you find the exact download link for your specific board version. Firmware Update - Dahua Wiki