Zosi view update12/1/2023 ![]() Some customers have reported issues when downloading this file using the "Microsoft Edge" browser. ![]() Note: to perform this process, you will want to use a USB 2.0 drive ideally 16 GB or less in size, formatted in FAT32. (Please save the upgrade file rootfs-3520dv300 in the root directory, not save it under any other folders.) You can follow up the guide below to upgrade the DVR:ฤก) You needn't open the upgrade file, please directly download the upgrade file and save it to your U-disk. If your DVR's label is lost, please go to DVR's Main Menu - Information - System to take a photo to us, we will send the correct upgrade file to you. You can find your DVR's model number on the label at the bottom of your DVR. This upgrade file works for the ZR04LN and ZR04LM DVR.
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