The MediaTek USB VCOM driver dropped the connection right as the interface switched from Boot ROM (BROM) mode to Preloader mode.
Getting stuck at "Download DA 100%" (red bar) in SP Flash Tool typically indicates a communication failure between your PC and the Mediatek (MTK) device's Boot ROM . While the Download Agent (DA) has reached the device, the tool is unable to proceed to the next stage, often due to driver conflicts, power issues, or secure boot restrictions. Common Causes for the 100% Hang
: A faulty USB cable, a damaged port, or insufficient power from a USB hub can cause the communication to drop immediately after the DA is sent. Hardware Mismatch
In SP Flash Tool, uncheck all partitions except preloader , boot1 , and boot2 . Flash only those. If that succeeds, flash partitions one by one. A dying eMMC can sometimes be flashed in small chunks. sp flash tool stuck on download da 100
SP Flash Tool frequently conflicts with blue USB 3.0/3.1 ports. Always plug your cable into a legacy USB 2.0 port (usually black or grey).
Follow these technical solutions in order, ranging from simple environmental fixes to advanced hardware-auth bypasses.
SP Flash Tool allows you to load a custom DA. The default MTK_AllInOne_DA.bin sometimes has compatibility issues with certain chipsets (especially MT65xx, MT67xx, or newer MT68xx). The MediaTek USB VCOM driver dropped the connection
If the software fixes fail, the physical link is often the issue.
: Ensure the phone is completely off. Some devices require the battery to be during the flash, while others require it to be or for you to hold Volume Down while connecting. Try an Older Version
: For some older models, try removing the battery (if possible) and connecting the phone without it. Tool Version : Ensure you are using the latest version of SP Flash Tool Common Causes for the 100% Hang : A
The most frequent offenders are in the physical chain between your phone and PC.
What is the exact of your device or its MediaTek chipset (e.g., MT6752, MT6580)? Which version of SP Flash Tool are you currently running? Are you flashing a stock ROM or a custom recovery ?
Use a dedicated MTK Auth Bypass Tool to disable the secure boot protection before starting the flash in SP Flash Tool.
: Try different button combinations while connecting the USB cable: Volume Down , or both. Alternative