SANNCE 8Channel 1080n DVR Security System with Motion Detect and Email Alert Function, NO HDD Included

Can i add a hard drive I have a few

I just bought the new sannce dvr version. but it comes with a very old software version. did i receive a bad dvr with the wrong firmware?

My camera feed images flash every three seconds. After a while, images scramble requiring unplugging the cameras. Is my unit defective?

Has anyone been able to reach support