Use a tool like MTK Auth Bypass Tool (by MCT) or LibUSB . These tools "exploit" the stack to disable the security check momentarily, allowing SP Flash Tool to communicate with the device. 3. Update Your DA (Download Agent) File
Ensure you are using the correct Custom DA file for your specific model (e.g., MT6765, MT6833) rather than the default MTK_AllInOne_DA.bin . 4. Switch to Preloader Mode brom disabled by efuse 0x146 best
Instead of holding buttons to trigger BROM, you simply plug the phone in while it is powered off. Use a tool like MTK Auth Bypass Tool (by MCT) or LibUSB