Hi guys, I purchased a CCTV set up three years ago and after set up, moved away for some time. i left the cctv there and Unfortunately I have returned to help the new owner but I cannot get back into the menus! I've tried all the usual password combos and holding the power button for 30 seconds without success. There is no real description other than on the DVR. There is a model number: XE 1604 ng and that's it. Could anyone help identify my CCTV set, and if so, advise me in a password reset? Thanks in advance.