Installing stock ROMs to fix software bugs or unbrick "dead" devices.

: Support for MRT has significantly declined, and many users have migrated to more stable alternatives like the Miracle Power Tool for current device models.

However, for the hobbyist or small shop looking to save money: The security risks (ransomware via Chinese cracks) and instability (bricked patient drives) will cost you more in the long run than buying a legitimate PC-3000 or using a software-only alternative like VNR.

No waiting for a physical dongle to arrive in the mail.