Azy2333

Hi Everyone, Sorry if this is in the wrong section, I'm having an issue please advise. I've forgotten my admin password for my DVR. Model number: MD404EN-AHD Below is a picture of what the box looks like from the front. I've looked online and I cant find a master password or even any tricks off holding buttons etc. will i need to open it up and reset the BIOS? please could anyone help with this issue. Thanks in advance, Regards