How to Fix PC to Detect MTK Device After Flashing With a Wrong ROM/Firmware

Technically It is not recommended to flash the preloader.bin file found inside a ROM folder except You are really sure that the preloader.bin is exactly the one for that device. And since we are humans enough to make mistakes we recommend you to understand this;

What happens?

If you made a mistake and flash a ROM with a preloader.bin file which is not the one of the device, the preloader partition gets corrupted thus making the device not being detected by the PC, boot or even charge (Dead Boot). Since it cannot be detected, there is no way you can reflash the phone even when the original ROM of the device is now available.
This article will show you how you can get your PC to be able to recognize the device again if its in such situation. This process to repair dead boots of mtk devices is known as Test Point.

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Disclaimer
Romkings is not responsible for what ever may happen to your device after using this procedure
Do this at your own risk!

- First you will have to loose the screws of the phone and take out the board.

- Then on the board, you will find golden points with various labels like Tx, Rx, Vcc, KCOLO, COLO, KOLO, GND etc

- Now locate a golden point with lable KCOLO or KOLO or COLO on the board. Sometimes these 

points are found at the volume terminal.

- Solder a wire on that point (KCOLO, KOLO or COLO)

- Locate the golden point with GND or normal ground on the board.

- Join the wire form KCOLO or COLO or KOLO to GND on the board.

- After joining this 2 points, connect the device to the PC and see if it detects.

- If it doesn't, look for another golden point with same label till your device gets detected by PC.


- When your device is detected by PC, it shows as MTK USB COM inside device manager.

- Now you will have to quickly flash the original preloader.bin file or complete ROM.

- After a successful flash process your device, you can now cut off the wire which you connected.

- Couple back the phone & Reboot.

- Points to note

- Never use the Tx, Rx, Vcc or any other point that carry some amount of voltage

Hope this method works for you