For : Power off the device and hold Volume Up + Down while plugging in the USB.
: Specifically for MTK devices, it can disable the SLA/DAI authentication required by modern security protocols to allow flashing. mtk-qualcomm-unlock-tool-v1-3-free-download
: Ensure you have MTK USB Drivers and Qualcomm HS-USB QDLoader 9008 Drivers installed on your PC. Connection : For : Power off the device and hold