This error indicates a or baud rate disagreement during the serial handshake. The 0x68 response is often a "NACK" (Negative Acknowledge) or a status byte in protocols like IEC 60870-5-101/104 , DLMS/COSEM , or custom embedded systems .
Ensure both the Host (PC/MCU) and the Peripheral have matching baud rates. handshaking... error unexpected response 0x68
: For devices that are stuck or not responding (often showing a charging light but not turning on), letting the battery drain completely can reset the bootloader state. Force Restart into BROM protocol mismatch This error indicates a or baud
Use the to ensure the "MediaTek USB Port" (or Preloader port) is correctly filtered. handshaking... error unexpected response 0x68