Sometimes Acer B3 mobile gets stuck in Google Account lock after factory reset, which is called FRP. At this time, the user is faced with a system that boots but is not usable. Usually, there are many ways to bypass FRP, but it is not that easy on MTK phones due to secure boot. DA Auth File is actually the key that gives the tool access to the protected layer from where FRP tokens can be removed. Most of the time, tools like SP Flash Tool or Miracle Thunder deny access without this file. Without the DA file, you cannot write preloader or frp partition..
If you are facing issues like hanging or auto restart in Acer B3 mobile, then it may be related to corrupted cache or system partition. When the mobile becomes slow and errors like 'System UI Not Responding' start appearing when you go to settings, then with the help of DA Auth File, the mobile can not only be reflashed but also the cache partitions can be formatted, which is not possible even with factory reset. With the help of this file, tools get deep access, which brings Android's internal configuration to default. Many times, DA Auth File becomes the only way to unbrick mobiles that have been flashed with custom ROM and have been bricked.