: Compatible with various Hisilicon SoCs, including Hi3520A, Hi3520D, Hi3521, Hi3521A, Hi3531, Hi3531A, Hi3535, and Hi3536.

The standout feature of the V402R11 firmware branch is its refined processing pipeline for both legacy and modern H.265 (High Efficiency Video Coding) streams.

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | "Update file mismatch" | Wrong board version | Download firmware specific to your PCB number (e.g., V4.02.R11.5 vs .4) | | Camera shows "H.265 Not Supported" after update | Main stream settings reset to H.265+ | Manually set encoding to H.264 or standard H.265 (not H.265+) | | DVR freezes at boot logo | Corrupted partition | Enter bootloader (hold Reset + Power). Use TFTP recovery or serial console. | | Lost admin password | Firmware reset credentials | Use default passwords: 12345, admin, or 888888. If not, use OEM password reset tool. |

Insert the USB drive into a vacant USB port on the recorder.

is a specific firmware version for HiSilicon SoC-based Digital Video Recorders (DVRs) and Network Video Recorders (NVRs) produced by manufacturers like Xiong Mai (XM)

Finding the correct firmware for your DVR or NVR is critical to ensure compatibility with H.264 and H.265 compression standards. This firmware version is widely used in devices based on Hisilicon SoC chipsets (such as Hi3520A, Hi3521, or Hi3536). Key Steps to Download and Install V4.02.R11 H.264/H.265 DVR/NVR Firmware Download

Power cycle the device. If the screen stays black, the firmware file was likely corrupted, and the board will require a recovery flash via a TFTP server or a serial TTL connection.

: Insert the USB into the recorder, go to Main Menu > System > Upgrade , select the file, and click Start .

: Provides a compiled list of V4.02.R11 firmware for various SoC models ACME Güvenlik

: Log into your DVR/NVR and navigate to [System Info] > [Version] .

Visit the official Xiongmai Service Page for authentic firmware files.

To ensure high-quality performance and avoid bricking your device, you must match the firmware to your specific hardware model .