In Windows Device Manager , find the "USB Host Controller" or the specific device under "Ports (COM & LPT)," right-click, and select Uninstall .
If you have tried all the above, your device may have hardware damage:
: The "VCOM" or "Preloader" drivers required for flashing are either not installed or have become corrupted. flash tool failed to enumerate a certain com port
After driver install, when you connect the phone, Device Manager should briefly show a "MediaTek PreLoader USB VCOM Port (COM3)" or similar. If you see that, the enumeration is working.
. This often happens because of driver conflicts, hardware issues, or system-level restrictions. formacionpoliticaisc.buenosaires.gob.ar 1. Core Troubleshooting Steps If your device isn't showing up, try these immediate fixes: Check Device Manager and select Device Manager . Look under Ports (COM & LPT) In Windows Device Manager , find the "USB
October 2023 Target Audience: Android developers, advanced users, smartphone repair technicians, and hobbyists attempting to flash firmware.
To diagnose whether your PC enumerates the COM port at all: If you see that, the enumeration is working
A: Use a completely different PC. Sometimes Windows registry corruption is unrecoverable. A fresh Windows installation on a separate partition is a last resort.
The flashing tool was unable to detect or access a specific COM port required for communication with the target device. Enumeration of the COM port failed, meaning the tool could not retrieve the port’s information or confirm its availability.
When you plug a device into your computer via USB, the host controller (your PC) sends a signal to the device asking, "Who are you?" The device responds with a set of descriptors—its Vendor ID (VID), Product ID (PID), and power requirements. This handshake process is called .