If you can provide proof of purchase, contacting the local distributor or manufacturer with the device's serial number is the most reliable way to obtain a unique master code.
(if you never changed it)
If default passwords don't work, a physical reset is often the most reliable way to restore the device to its original factory settings. how to reset multistar dvr password
He downloaded the file to a USB flash drive (formatted as FAT32). If you can provide proof of purchase, contacting