When you get errors like "authentication required" or "S_AUTH_HANDLE_IS_NOT_READY" while trying to flash a Huawei Y3II LUA-L21 mobile, it is a sign that there is a specific security layer inside the mobile that resists external flashing. DA Auth File is a means to bypass this security. With its help, not only the flashing process is completed successfully, but also the internal secret sections of the mobile such as nvram and protect1 can be restored. This file becomes a powerful weapon in the hands of a trained technician.
Problems like "invalid IMEI" or "baseband unknown" in Huawei Y3II LUA-L21 mobiles are usually caused by corruption of nvdata or modem partitions. To rewrite these files, it is necessary to bypass secure boot, for which the use of DA Auth File is indispensable. With the help of this file, the modem in the mobile can be reflashed and the IMEI can be restored again. In this process, common tools fail unless the DA file is provided, which opens this lock.