salt11

I've made a call to China and solved the problem. Thanks everyone

Thanks for correcting the name of batter. The mentioning of computer motherboard was to show the steps which was successful on a computer motherboard is not working on this DVR, which only resets the date and time of DVR to 1/1/2000 00:00:00. Do I need to format the hard disk of the DVR to remove the prompt of login screen on DVR? Because on the computer motherboard the prompt of login disappears as well as the password. After removing CMOS battery on computer motherboard I'm able to go to BIOS setting by just pressing F2 without any password

Hi, the back of unit matches the DVR. I've emailed to the company, let's wait for their reply.

hi, is there any method to reset the admin password for the DVR below? I've got the permission from owner to reset it but only manage to reset the time by removing the coin battery several minutes. but still unable to login to admin account. it's been years since the management of this condominium took care of it and they have lost the receipt and contact for the original supplier. its model is DVR-8516E-AE. no brand name printed on circuit board also the same method of removing coin battery was tested successfully with a normal computer motherboard, but not with this DVR. thank you for your help in advance