If you want, provide the Tronitek DVR model number and whether you have physical access; I can give step-by-step reset instructions specific to that model.
If you changed the admin password, you must update the password in your phone app (like XMeye, EasyVie, or SuperLive Plus). Go to the device settings in the app and re-enter the new password. tronitek dvr admin password
If you set these up during installation, answering them will allow you to create a new password immediately. If you want, provide the Tronitek DVR model