Do you have the from the label on the bottom of your DVR to ensure you have the right version? ZR08DE_V1.1.5 Upgrade File_rootfs-hi3520d - Zosi Support
Wait several minutes—do power off the unit until it restarts. Critical Precautions Download Firmware DVR Hi3520D 95P 8Mb Backup rar
Use a USB 2.0 drive with a capacity of 16GB or less , formatted to FAT32 . Do you have the from the label on
Ensure the firmware matches your DVR's hardware version. You can find this on the motherboard itself or in the System Info > Version menu. Using the wrong file can permanently damage the unit. Ensure the firmware matches your DVR's hardware version
Updating firmware for a DVR based on the chipset is a technical process typically used to fix system bugs, recover from a "bricked" state, or update the user interface. The specific file you're looking for ( Hi3520D 95P 8Mb ) corresponds to the hardware ID and flash chip size (8MB) of your device's motherboard. Key Steps for a Successful Firmware Update