This error typically stems from a handshake failure during the initial boot phase. Common culprits include:

Comprehensive Guide: How to Fix SP Flash Tool Stuck on Download DA 100%

When connecting the turned-off phone, Device Manager should briefly show MediaTek PreLoader USB VCOM (Android) without any yellow exclamation triangles. 2. Change or Update the Download Agent (DA) File

When this happens, the flashing process halts, and the device might end up in a soft-bricked state. This article provides a comprehensive guide to understanding and resolving this issue. What Does "Download DA 100%" Mean?

Different chipsets require specific DA versions.