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I checked the flash memory dump with the hex editor and I have found all the partition data. The files are the same the only difference is that those present in the update file have an initial header

unfortunately the user partition is not present in the update files

No, removing the battery, only some settings such as the date and time are reset but the password and the other user settings are not reset

I found a working dump and I flash the spi with the RT809H programmer. Now the NVR works fine but unfortunately I don't know the admin password and the other accounts are also locked. There is a way to reset the unknow admin password without logging in ? Or there is hard reset procedure to...

sorry for my very bad english I'have a dahua nvr 5232 bricked i can connect to uart and this is the u-boot version B2020> version U-Boot 2013.01-svn1371 (Jan 30 2015 - 13:27:11)svn:1371 armv7-linux-gcc (GCC) 4.6.3 20120301 (STMicroelectronics/Linux Base 4.6.3-113) GNU ld (GNU Binutils -...