| 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. |
Click ; the software will likely display "Wait ROM request...". | Cause | Explanation | |-------|-------------| | |
is correctly installed on your PC and that you have selected the correct in the tool. Cable Type | | Buffer overflow | Sending data too
If you can establish a brief connection before the error, use the tool to perform a of the flash memory before attempting to write the new firmware. | Click ; the software will likely display