If your phone is stuck in a boot loop or won't turn on (black screen), flashing the firmware via the scatter file is often the only fix.
: Using this option can wipe your device's NVRAM and IMEI information, leading to permanent loss of cellular signal unless you have a backup. mt6769 scatter file hot
The "scatter file hot" method is already becoming more difficult. New tools like and UnlockTool now emulate a "warm" flash (a hybrid between cold and hot) using leaked engineering DA files. If your phone is stuck in a boot