When Acer A30 mobile is not recognized by different flashing tools, and every time brom error or authentication error occurs, the main reason is that the tools do not get the required handshake from the mobile. DA Auth File provides the cryptographic key that enables the tool to communicate with the mobile. Without this file, you cannot write any partition of the firmware. There is a specific DA file for each brand and each model, which if does not match, flashing fails..
Acer A30 If a mobile is locked with Mi Cloud or Huawei ID, it is almost impossible for a normal user to unlock it. But technicians operate tools through DA Auth File that enter the mobile’s partitions and clean the security files. Although this process may be against OEM policy from a legal perspective, it is the only way out in some legitimate cases, such as someone having their own phone and forgetting the account. DA File then crosses the encryption layer and gives us access that is not possible for a normal user.