Hi Ramona.
this is a forum link with people with the same problem you have got and it is telling people on how to reset this dvr.
this is not to say it will help you but go and have a look.
https://www.avforums.com/threads/sannce-dvr-system-reboot.1905253
you could also try this link and see if it helps you out.
Where is the reset button for sannce dvr Google Search
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