Many times, a local vendor or technician incorrectly flashes a Tecno Spark 4 KC8 mobile, resulting in the mobile not only becoming dead but also corrupting the secure boot. Such mobiles are neither recognized by tools, nor are any partitions written on them. The DA Auth File then acts as a special key, which temporarily disables the secure boot so that tools can be given permission. It is an encrypted file based on a special configuration that can only be obtained from the OEM..
If you have ever done a file mismatch while upgrading the firmware on a Tecno Spark 4 KC8 mobile and the mobile has become dead, then you probably know that in such a situation only DA Auth File works. Because at that time the tool does not recognize the mobile as a device, here a special handshake is completed with the help of DA file, after which the tool can read the partition table and it becomes possible to flash the correct firmware.