Handshaking... Error Unexpected Response 0x68 -

The binary pattern 0110 1000 has an even parity. If the host system is configured for "No Parity" or "Odd Parity," and the line noise is low, this is likely a valid data byte, not random garbage (which usually manifests as 0x00 or 0xFF ).

Before diving into the error itself, let's quickly review the concept of handshaking. In computer networking, handshaking refers to the process of establishing a connection between two devices, such as a computer and a server, or a device and a network. During handshaking, the devices exchange information about their capabilities, negotiate communication parameters, and authenticate each other. This process ensures that both devices are compatible and can communicate effectively. handshaking... error unexpected response 0x68

The handshake is the "digital greeting" between your PC and the phone. When the phone sends The binary pattern 0110 1000 has an even parity

Sometimes, antivirus software or other phone managers (like iTunes or Samsung Smart Switch) interfere with the serial port communication. Disable these temporarily to give your flashing tool exclusive access to the USB port. If you’d like more specific help, let me know: are you using (e.g., UnlockTool, SP Flash Tool)? What is the of the phone? In computer networking, handshaking refers to the process

If you connect a TTL device to an RS-232 port without a level shifter:

When the MCU expects a standard reply like "OK" (which starts with 0x4F ) or "RDY" but receives 0x68 instead, the handshake protocol fails, and the driver throws an "unexpected response" error.

Security software can sometimes block the low-level communication required for handshaking. Temporarily disable your firewall or antivirus and run the tool as an Administrator. Are you using a specific software like UnlockTool SP Flash Tool when this error appears?