If you are on a very old version (V3.x), you may need to update to V4.20.000 first before moving to V4.30+ to prevent bricking the device.
The most recent stable versions generally follow this progression: Download Firmware HIKVISION 7208HQHI K1E Backup rar
Place digicap.dav in the root folder of your USB. Update: Insert the USB into the DVR. Go to Menu > Maintenance > Upgrade . Select the file and confirm. If you are on a very old version (V3
The download is usually a .zip . Extract it to get the digicap.dav file. Download Firmware HIKVISION 7208HQHI K1E Backup rar
The device will reboot automatically. Do not power off during this process.