Please help! dvr dius

[Preechso 0]

Hello, I'm new here so thanks for having me.

I bought a dvr few years ago.

It's called Dius model : Dtr ip-  1080P08N(I can't find many details about it).

Now i forgot the password and now the system it's blocked. I found a general information online which it is working for more brands and platforms but it doesn't work on mine or at least I can't make it work.

My question is, anyone know how to reset the dvr to factory settings?

I tried with taking off the battery   , with the last one I can't even get into the system. Any instructions or videos on how to would be appreciated.