Some "patched" firmware requires an unlocked bootloader to bypass RAM checks.
Do not try random firmware. Follow this order:
Depending on your access to specialized files, use this reference table to choose your best course of action: Repair Route Difficulty Success Rate (Patched Devices) Primary Trade-Off
Faulty communication over the COM port will drop connection packages, leading SP Flash Tool to assume the external RAM has failed. Open Windows . Connect your device in flashing mode (powered off). Look for MediaTek Preloader USB VCOM Port or MTK USB Port .
Most modern MediaTek phones require an Auth Bypass Tool to be running in the background. If you receive a timeout at "DA Download 100%," ensure the bypass tool is active and you have set the Connection Type to UART with the correct COM port.
This error typically triggers during the early stages of the flashing process—right after the red progress bar fills up and just as the tool attempts to initialize the External RAM (DRAM) via the Preloader.
When this error occurs, the flashing process halts immediately, preventing any firmware installation. Understanding the root causes and applying the correct patches is essential to restoring the device to working order. Root Causes of the Error
The standard Download Agent provided with SP Flash Tool lacks the correct EMI (External Memory Interface) configuration for your specific chip variant.
Use a high-quality USB cable and a port directly on the motherboard (avoid USB hubs). Quick Tip: If the device was previously formatted, try unchecking the
Hardware variations within the same model using different RAM vendors (Samsung, Micron, SK Hynix) that the standard Download Agent doesn't recognize.
Download the latest version of SP Flash Tool. Often, using a "patched" version designed for Xiaomi or MTK devices works best.
To solve this, you need to align your software "key" with your hardware "lock": Verify Your Firmware
Fixes and workarounds