| Check | Action | |-------|--------| | | Use a direct USB 2.0 port (not hub). Short, shielded cable. | | Driver isolation | Remove all other USB devices. Use libusb or usbip on Linux; disable modem drivers on Windows. | | Timing | Trigger download mode after clicking "Download" in the tool, not before. | | Download Agent (DA) | Use the DA file exactly matching your SoC (extract from official firmware). | | Power supply | Some devices need a battery with >20% charge or external DC power for BROM stability. | | Secure boot bypass | For production devices with locked BROM, use an authenticated DA (requires vendor signing keys). |
: The PC often requires specific MediaTek USB VCOM or UsbDk drivers to recognize the device in its low-level state. brom protocol error check device environment
Using a faulty USB cable, an unstable USB port, or a device that isn't fully powered off. | Check | Action | |-------|--------| | | Use a direct USB 2