dahua dvr 2 admin accounts. can't delete one

Likask

n3wb
Oct 14, 2020
1
0
Spain
I basically have a dahua dvr that contains 2 accounts. an admin that the password I do not know and is not one of the factory. And I have another one where my user is and is on the admin group. However, I cannot delete the admin account. It says "you cannot remove the reserved user"
Anyone can help with a simple solution?