Hi there!!
I have a firmware dump from from a board "AHB700XT8-3520D V4.06" as it was printed on the PCB, which is similar to the yours. I extracted it from a working DVR and there is no password for logging. The thing is that it weights about 12MB and i cant upload it here. The maximum limit is about 6MB or something...However, i attached some pictures i took from the device board at the moment of reading it, to help you to compare with your own hardware and see how different it can be from the one im sending here.
See first if the device from the pictures i attached is similar to the yours, and if it is, then you can give me your email, and i will be very happy to send the firmware file to you.
Alternatively, if there is any other way or place i can upload the file here, if someone is able to explain me, i will be also happy to share the file.
Hope all this can help!
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