Most of the technical experts say that it is not possible to fix MediaTek security phones without DA file. The same is the case with Tecno Camon 16 Premier CE9 mobile, where only this file can open all the doors of flashing. If your Tecno Camon 16 Premier CE9 phone gets stuck at 0% during flashing or gives an error like "PMT changed", then the first step should be to use DA file, because it allows the system to be unlocked and proceed.
In some cases, the bootloader of the mobile is completely locked, and fastboot mode does not work. DA file is a technical trick that provides access to the partitions below the bootloader, especially in phones like Tecno Camon 16 Premier CE9. When Tecno Camon 16 Premier CE9 phone shows null IMEI or no baseband, the only solution is to restore nvram, which is not possible without DA file. This file unlocks system permission so that we can rewrite modem data.