Half of Samsung devices come with a MediaTek chip. These chips come with a special mode called BROM or emergency mode. This is something that by default is not enabled but if the device goes into broken mode it will activate to allow the device to be flashed without the need for a jtag connection.
There’s a tool called Android Utility Tool that comes with a very shitty support, website, and documentation. In my journey, I thought I give it a shot as the phone that I was playing with wasn’t so important to me. Unfortunately, I used the tool to put my device into the BROM mode and the device got bricked with a black screen and no reaction whatsoever.
The solution was easy just get a stock ROM extract Bootloader files uncompress the LZ4 file format and then use the write boot_section and write a preloader file to the device. And your device will work revive again.
Final note MediaTek mode only enables for a few seconds after you reboot the device so each time you want to execute an action you have to keep Holding the power button or some combination for a few seconds or more.
