Several BLU smartphones run on various Mediatek chipsets. It's a viable alternative to Qualcomm chipset for Android mobiles. So, this usage has drawn requirements of several USB drivers and there are several chipset models released by the company as well.
If your device doesn't turn on, then definitely you have the boot loop issue. It can be fixed by flashing the stock firmware on your device. You can then install the BLU USB drivers if you have the BLU Phone.
If you use SP Flash Tool on your PC. While you flash any MTK based Android smartphone. You need to store the MediaTek USB-VCOM drivers auto-installer. Because the installer helps you to automatically fix any driver missing while connected to your Android devices... 2b1af7f3a8