The default MTK_AllInOne_DA.bin included with SP Flash Tool doesn't work for every phone, especially newer models or those with Secure Boot. In SP Flash Tool, look at the field. Click Choose .
Changing the flash mode can reset the DA handshake.
If you are still stuck, the DA itself is the enemy. You can try a "low-level" format first (Warning: This wipes everything, including IMEI).
Connecting the device with or without holding the volume keys at the wrong time.
Look inside the extracted firmware folder for a file named something like DA_SWSEC.bin , MTK_AllInOne_DA_SP.bin , or custom DA files tailored to your brand. Open SP Flash Tool. Go to the field (top row) and click Choose .