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: Log into your recorder and navigate to [System Info] > [Version] .

: Optimized for Hisilicon-based processors, including the Hi3520, Hi3521, Hi3531, and Hi3536 series. How to Identify Your Current Version v403r11 h264 h265 dvr nvr firmware download hot upd

: If the DVR cannot boot, check the motherboard for a printed hardware model or version number. Download and Installation Guide : Log into your recorder and navigate to