Step 1:
update to the newest firmware, main program .bin file and firmware.bin file both need to be updated.
If step 1 doesn’t work, then
Step 2:
Install the specific configtool, output the .dat file and transfer to your Dahua technical support.
Specific configtool:
https://drive.google.com/file/d/1sPIbh-ykzL29wX0K1LRgl1sy7zAv-DyB/view?usp=sharing
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