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Recent reports indicate that older versions of the V4.02.R11 firmware may contain vulnerabilities to stack-based buffer overflows. It is essential to download the most recent, patched version to protect your system from remote attacks. V4.02.R11 H.264/H.265 DVR/NVR Firmware Download
: Hi3520A, Hi3520D, Hi3521, Hi3521A, Hi3531, Hi3531A, Hi3535, and Hi3536. Device Types : 1080N AHD, 1080p AHD, 5MP, and 4MP DVRs/NVRs.
Insert the USB drive into a vacant USB port on your DVR or NVR.
Navigate to Main Menu > System > Information or Version .
Websites like or CCTV Camera Pros often maintain clean archives of legacy firmware. Only download if the MD5 hash is provided and matches OEM releases.
: High-Efficiency Video Coding (H.265) streams require up to 50% less bandwidth than H.264.
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This specific release is highly sought after due to its stable support for both legacy and modern H.265 compression standards. It provides a balance between efficient storage usage and high-quality video playback, making it ideal for 4-channel, 8-channel, and 16-channel security systems.
: Offers a central hub for latest factory neutral firmware and upgrade software for XMEYE-compatible devices. Upgrade Instructions V4.02.R11 H.264/H.265 DVR/NVR Firmware Download
: Provides a compiled list of V4.02.R11 downloads categorized by Hardware ID.
To avoid bricking your device (rendering it permanently unusable), you must locate the exact match for your specific hardware. Follow these steps to find a high-quality, safe download: Step 1: Identify Your Exact Device Model
: Firmware updates typically include patches for security vulnerabilities, ensuring that the DVR/NVR systems are protected against potential cyber threats and unauthorized access.
A quick search reveals that "V402R11" is not a standard model number for a specific brand like Hikvision or Lorex. Instead, it is a codename likely used by generic or white-label manufacturers for devices built around a system-on-a-chip (SoC), possibly the Hi3520D or Hi3520A .