Research your specific chip/board (e.g., HiSilicon, Amlogic, Broadcom, MStar). Common boot interrupt keys:
: Ensure your USB-to-UART adapter drivers are updated. Cheap "clone" chips often have stability issues with BootROM-level communication. ✅ How to Fix It Research your specific chip/board (e
: This is the smoking gun. The Universal Asynchronous Receiver-Transmitter (UART) buffer on the target device is full. The BootROM is trying to read incoming data from your PC, but its internal FIFO (First-In-First-Out) buffer has overflowed. It cannot process new data, so it freezes and repeats the error. ✅ How to Fix It : This is the smoking gun
| Cause | Explanation | |-------|-------------| | | BootROM expects a specific baud rate (e.g., 115200), but your terminal uses another (e.g., 9600). | | Flow control mismatch | Hardware flow control (RTS/CTS) may be needed but is disabled, or vice versa. | | Faulty serial cable/adapter | Poor connection, wrong voltage (3.3V vs 5V), or broken TX/RX lines. | | Buffer overflow | Sending data too fast without handshaking → UART FIFO overruns. | | BootROM waiting for a keypress | Some devices require pressing a key (e.g., Ctrl+C , Enter ) during boot to interrupt normal boot. | | Corrupted boot image | The file being sent over UART is incomplete or malformed. | It cannot process new data, so it freezes
The you are using (e.g., GXDownloader, Putty, Hitool).