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Is there anyway to interrupt the bootup and run commands to change the firmware?

No. It doesn't.

Unfortunately there is no "switch user" in lower cnr. There is a dropdown on the user id field, but it simply lists about 20 or so similar lists of the same symbols

I have a NVR DS-7608NI-I2 which had Ver. 3.4.93 build 170325. I attempted to update to NVR_K51_BL_ML_STD_V4.40.015_200616. Now after the NVR reboot, the login screen on the monitor attached to the NVR will not allow me to input a User ID. It displays a dropdown set of symbols only (square...