Windows 10 strictly blocks the installation of unsigned drivers, which includes the MediaTek (MTK) VCOM drivers needed for BQ devices. You must temporarily disable this security feature.
: Essential for Windows 10 to communicate with your BQ device in "Preloader" mode. SP Flash Tool : Download the latest version of SP Flash Tool and extract it to a folder on your PC. Stock Firmware
Ensure your BQ device has at least 50% battery life to avoid power failure mid-flash.
Hold down both the and Volume Down buttons simultaneously, then plug in the USB cable. This triggers Emergency Download Mode (EDL). bq firmware flash tool windows 10
Monitor the status log at the bottom. Once it reads "Download Succeed" and "Finish Download," it is safe to unplug your BQ device. Hold down the Power button for roughly 10–15 seconds to force-reboot it out of EDL mode. Troubleshooting Common Errors
Flashing official firmware on your BQ smartphone or tablet is the most effective way to resolve severe software issues. Whether your device is trapped in an infinite bootloop, suffering from frequent system crashes, or you simply want to revert to a clean, factory-state operating system, the official BQ Firmware Flash Tool is the utility designed for the job.
Reinstall the USB drivers, try a different USB port (preferably on the back of the PC), or use a different USB cable. Windows 10 strictly blocks the installation of unsigned
Inside the tool, locate the field on the right side. Click the Choose button next to it. Navigate to your extracted BQ Firmware folder, select the text file ending in _Android_scatter.txt , and click Open . The tool will populate a list of system partitions (boot, system, recovery, etc.). 3. Choose the Correct Flashing Mode
With driver signature enforcement disabled, you can now install the communication bridge:
Below that, in red ink:
If your BQ device uses a Qualcomm processor, the official BQ Flash Tool utilizes Fastboot mode to rewrite system partitions.
Flashing the firmware on a BQ device typically requires specialized tools depending on the device's chipset (MediaTek or Qualcomm). For most MediaTek-based BQ devices, the Smartphone Flash Tool (SP Flash Tool) is the industry standard for updating or restoring stock ROMs on Windows 10.
When BQ released many of its popular devices between 2014 and 2016, Windows 10 was still evolving. To use the flash tool today, users often face a "security" hurdle: Windows Driver Signature Enforcement SP Flash Tool : Download the latest version