This method is typically used for recovery purposes if a standard update fails. It involves running a TFTP server on a PC to "force" the firmware onto the DVR. The user manual provides instructions for FTP upgrades (which is similar in concept). This is a more complex process and should only be attempted if other methods fail.
Your choice depends on your priorities:
Always download firmware from official sources. Hikvision's official download portal is the most reliable. firmware hikvision ds7104hghif1 top