MTKClient is arguably the most powerful open-source tool for MediaTek devices. It bypasses the need for a working preloader by utilizing specialized exploits (like kamakiri and linecode exploits).
These tools are primarily used by technicians to service devices that cannot boot normally or are stuck in a "brick" state. mtk preloader repair tool
Ensure your device is charged to at least 50% before initiating any flash scripts. MTKClient is arguably the most powerful open-source tool
Advanced users with dongles.