Latest recommended version for most regions. V4.30.210: Common stable baseline for K1/E models.
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. Download Firmware HIKVISION 7208HQHI K1E Backup rar
The most recent stable versions generally follow this progression: Latest recommended version for most regions