If the Huawei Y5II CUN-U29 mobile gets an "Encryption Unsuccessful" error, then the mobile cannot be fixed even by a simple factory reset. At this stage, the DA Auth File becomes the basis that gives SP Flash Tool access to the encrypted partitions of the mobile. You can not only remove the corrupted userdata but also restore the device securely by reformatting it. This is the path of advanced repairing that only experienced people take.
Sometimes the touchscreen stops working in Huawei Y5II CUN-U29 mobiles, especially if the wrong firmware has been flashed. The only solution is to reflash the touch drivers, but this is only possible if secure boot is bypassed. The DA Auth File enables this flashing to restore screen responsiveness. This problem becomes more complicated when the preloader is corrupted, but a full recovery is possible with the DA file.