The preloader is the initial software layer executed by the MediaTek SoC's Boot ROM. It serves as an essential bridge, initializing core hardware and enabling the system to communicate with external tools via USB. When this layer is corrupted—often due to failed firmware flashes—the device enters a "dead boot" state where it cannot reach the operating system or standard recovery modes. Key Features of Modern Repair Tools (2025–2026)

He soldered the delicate jumper wires to the motherboard’s test points. TX, RX, GND. The copper threads looked like life-support IVs.

Five minutes later, a green circle appeared: