If you have obtained the correct .dav firmware file, follow these steps via the Hik-Connect or local interface:

Or via GUI tool:

Enter the DVR's IP address into a browser (Internet Explorer or browsers with "IE Mode" work best for Hikvision plugins). Go to .

dfu-util -a 0 -D DS-80249-P_REV_1_2.bin -s 0x08000000:leave

Users on Reddit have reported significant bugs in the web interface for this revision. A notable issue is the system hanging when creating new read-only users. These users often end up with zero permissions, and deleting them can cause the interface to stay in a "processing" loop for extended periods.

Updating often resets configuration to defaults. Reapply your barcode symbology enable/disable list, beeper volume, and host interface settings.