If you want to install a custom ROM on your Hisense F23 mobile but secure boot does not allow it, then you need a DA Auth File. This file is created for specific devices so that SP Flash Tool can write to restricted partitions like boot, recovery, system. The ROM installation process is possible only when the tool gets root level permission, which is possible only through the DA file. Sometimes users see messages like "BROM Error" or "Auth Error" while flashing in SP Flash Tool. These errors occur when the mobile is on secure boot. DA Auth File bypasses these errors and makes flashing possible. This file is device-specific and authenticates SP Tool for flashing. The only solution to avoid these errors is to use the DA file.
When Hisense F23 mobile gives "Authentication Required" error while flashing, it is a clear indication that the chipset of the mobile is in secure mode. This problem is common in MTK devices. When SP Flash Tool adds this file, the device is verified and then the flashing process is smooth. If this file is not present, the user cannot go beyond boot, even if you have the firmware.