If a device is totally dead (hard bricked) and the computer detects it as "MediaTek USB Port" or "Preloader" for just a few seconds (then disconnects), you can use a patched preloader to "hold" the connection open so the flashing tool can push the firmware.
If you try to flash a device and encounter errors like "Status Sec: 0x00000004" or "Secure Boot Download Fail," it means the loader you are using does not match the device's security configuration. A patched preloader corresponding to the chipset (like this MT6580 file) is often the solution. preloaderk62v164bspbin patched
Vendors rarely release patched preloaders publicly. A “patched” version usually comes from: If a device is totally dead (hard bricked)
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If you arrived at this keyword because you are working with a device or firmware, here are related topics for which long articles do exist: Vendors rarely release patched preloaders publicly