Do you have the showing on your DVR screen, or can you see a QR code on the login page?
If no button is visible, you can force a reset by draining the internal memory: How to Reset Multistar DVR Password how to reset multistar dvr password
: If no external button is visible, you may need to open the case (after disconnecting power). Look for a small button on the internal motherboard (PCB) labeled "Reset" or two jumper pins that can be shorted with a screwdriver to trigger a factory wipe. Do you have the showing on your DVR
Resetting a Multistar DVR password usually requires physical access or a master reset. Here are the most common methods: how to reset multistar dvr password