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
From forum reports, these models frequently exhibit this behavior along with specific fixes:
:
Windows Fast Startup can interfere with USB enumeration during the BROM → DA transition.
High-speed USB configurations can cause packet loss during the critical DA hand-off phase. Adjusting the tool's internal connection settings can stabilize the process. Open . Navigate to Options > Option... > Connection . Locate the USB Speed setting. Switch it from High Speed to Full Speed . Close the options menu and attempt the flash again. 5. Adjust Device Connection Timing and Buttons sp flash tool stuck on download da 100
| Cause Category | Specific Issue | |----------------|----------------| | | Wrong USB VCOM driver, driver signature disabled, or driver conflict. | | USB Problems | Bad cable, USB 3.0 port, loose connection, or power fluctuation. | | Storage Failure | Corrupted eMMC, damaged partitions (especially NVRAM or bootloader). | | Bootloader State | Bootloader is locked or partially bricked (BROM mode disabled). | | Version Mismatch | Using an outdated DA or SP Flash Tool version for your chipset. | | Battery/Voltage | Dead battery, battery too low, or phone refusing to stay in BROM mode. |
Prevents Windows from dropping the COM port connection during hand-off.
No buttons at all (Just plug it in with the device completely powered off) 3. Fix MediaTek VCOM Driver Issues
As Android security has evolved, bypassing manufacturer protections has become a necessary step for flashing. When connecting the turned-off phone, Device Manager should
: Ensure you have the correct MediaTek (MTK) VCOM drivers installed. If they are corrupted, uninstall them using a tool like USBDeview and reinstall the latest version.
Getting stuck at "Download DA 100%" is essentially a security handshake failure. By systematically isolating the issue—starting with bypassing the hardware authentication, verifying that your custom Download Agent file matches your device firmware, and ensuring your VCOM drivers are stable—you can push past the freeze and complete your firmware restoration successfully.
: Use a tool like USBDeview to uninstall all existing MTK and VCOM drivers.
This guide provides a comprehensive, step-by-step approach to diagnose and resolve the "Download DA 100%" error. We will start with the simplest environmental checks and progress to more advanced technical solutions. High-speed USB configurations can cause packet loss during
Is your SP Flash Tool frozen at "Download DA 100%"? This 3000+ word guide covers 12 proven fixes, from driver issues to eMMC corruption, to unbrick your MediaTek device.
Some modern MTK devices require a "Bypass Tool" (libusb/auth bypass) to allow SP Flash Tool to communicate beyond the DA stage.
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