Firmware update account problems

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Nov 9, 2017
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Hello,

After being hacked on the system, I donwloaded and deploy the latest firmware version (2.1.02.01.13321_DH_HCVR42xx-S2_Eng_P_V3.200.0004.30.R.20151124) for my DVR (Dahua DH-HCVR4232AN-S2).
The upgrade went normal and after I changed the admin default password which is also "admin" and added a new use with admin role.

Just after a few days, the new user just dissappeared (deleted) and the admin password was back to default.
This happened two months ago and since then, this problem still apper daily, after a few days or weekly.

Does anyone know what to do? :(
 
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Also, a strange thing is that I have this default user I don't know his password and for 888888 account, the password 888888 does not work.
 

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