The error is a specific communication failure typically encountered when using Android servicing tools like UnlockTool , Chimera , or Pandora . It indicates that the device (usually a MediaTek or Qualcomm-based phone) sent a response byte ( 0x68 ) that the software did not expect during the initial boot-level handshake. Technical Breakdown
If you are using a proxy, ensure the proxy isn't intercepting the traffic and serving a "404 Not Found" or "403 Forbidden" page in HTML format. Verify that the server-side service is actually running. 2. Microcontrollers (ESP32 / ESP8266 / Arduino) handshaking... error unexpected response 0x68
Search the device’s manual for 0x68 or 104 or 'h' . Some devices use a custom handshake: "handshaking
0x11 (DC1).0x13 (DC3).0x05.