If the error persists, systematically eliminate variables:
Reinstall the or Rockchip USB drivers. 3. Refine the Shorting Procedure
Try different software altogether, such as the Android Tool for Rockchip devices. Summary Checklist Use USB 2.0 (rear ports on PCs) Cable Use a short, high-quality USB-A to USB-A cable Driver Reinstall USB Burning Tool Drivers Method Re-short NAND pins carefully Power Switch on after USB connection Bootrom Error Wait For Get Please Check Stb Uart Receive
STB Pin → UART Adapter GND → GND TX (or RX?) → RX (adapter) RX (or TX?) → TX (adapter)
If using an adapter with a voltage switch, ensure it is set to to prevent data corruption or hardware damage. Summary Checklist Use USB 2
Keep Device Manager open while connecting the STB. Look for a brief appearance of a port named MediaTek USB VCOM or USB Serial Port . If it shows a yellow exclamation mark, right-click and manually update the driver. 3. Inspect Hardware and Cables
The processor's primary boot code (stored in ROM) did not initialize properly. If it shows a yellow exclamation mark, right-click
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While holding that button, plug the USB cable from the PC into the STB's primary USB port (usually USB 1 or the OTG port).
Keep your logic analyzer close, your UART connections double-checked, and your bootloader binary verified. Good luck.