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Hi Everybody I have an XSecurity brand DVR ver 2.616.0000.0 I think it's Dahua based board, but I don't know exactly which firmware is suitable for it Please Help

After several power outages my Dahua NVR stopped sending emails and even after resetting it to default and re-entering all parameters no way to send email the status is online and averything work fine, the email account has no problem and the mobile application works perfectly, I did not flash...