If Huawei Y3 ( CRO-L02 ) mobile is getting errors like "Download Agent Not Found" or "Secure Boot Not Authorized", it indicates that a specific DA file is required to bypass the mobile's security server. In MTK devices, a separate DA file is created for each brand or model that handles encryption. When SP Tool loads this file, only then the mobile bypasses secure boot and gains access to the rest of the partition. This is the technical door without which you cannot enter.
Huawei Y3 ( CRO-L02 ) If you get the message "This Device is Locked to Previous Account" after factory resetting your mobile, you will need to bypass FRP. Now that Google lock has become quite strong in new Android versions, it cannot be removed by normal flashing. DA Auth File allows you to remove this lock by giving you access to the FRP partition. In some cases, using DA file with custom scatter file and erasing only the FRP section is the best solution.