Downloads labeled "MRT-key-v2-56-tool-free-download" or "without dongle" are typically cracked versions. These are frequently flagged as malware or Trojans by antivirus software because they often contain malicious code designed to compromise your PC.
If you are looking for more secure and up-to-date tools for mobile repair, consider:
Support for repairing IMEI numbers on MTK-based devices.
Users often report "unknown exception errors" or connection failures with these older, unofficial versions.
Fast removal of screen patterns, passwords, and FRP locks (often in under 60 seconds).
The original MRT Dongle project is largely discontinued, with more recent versions (e.g., v3.75 to v3.95) having been released before it went offline.