Some users use unauthorized tools like SP MDT, NCK, Miracle Box etc. on Huawei Y3 ( CRO-L03 ) mobile but they fail due to secure boot. DA Auth File is the only file that allows you to work with these third-party tools, provided that the tool has DA support. This way you can do firmware restore, FRP remove, or partition repair even without the company's official tools. This flexibility is not possible without DA file.
When the touch does not work or the display turns black after flashing in a mobile, it is usually considered a hardware problem, but most often it is due to a mismatch in the preloader or lk file. In such a case, if you flash with the correct scatter using the DA Auth File, these problems can be easily resolved. The presence of this file allows the SP Tool to write to all the secure sections, which is not possible in normal cases.