When you connect a powered-off MediaTek phone to your computer, the SP Flash Tool does not automatically know how to talk to it. The DA file is temporarily uploaded to the device’s RAM to initialize the memory interface. Think of it as a translator: the tool speaks one language, the hardware speaks another, and the DA file translates.
In the context of MediaTek (MTK) devices, stands for Download Agent . The DA file is a small piece of code that acts as a bridge between the SP Flash Tool (on your PC) and the device’s flash memory (eMMC). tecno bd3 da file