It bypasses the secure boot ROM of the device.
Click on "choose" next to the Download-Agent line. By default, SP Flash Tool uses MTK_AllInOne_DA.bin . Replace this by browsing to and selecting your downloaded custom Tecno_BD3_DA.bin file. tecno bd3 da file
If a software modification goes wrong and your phone refuses to turn on (soft brick or hard brick), specialized MTK tools use the DA file to force-feed the functional firmware back into the device's eMMC chip. 🔑 4. Pattern, PIN, and Password Removal It bypasses the secure boot ROM of the device