The error "handshaking... error unexpected response 0x68" is most commonly encountered when using or similar software to service mobile devices (often Oppo or MediaTek-based phones). It typically signifies a protocol mismatch or a failure in the initial communication between the software and the device's bootloader . Primary Cause & Solution
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If you’re working with embedded Linux systems (like NXP i.MX8MP-based boards), you might encounter a kernel panic referencing a handshake failure. A known instance involves the BLK-CTL module, where a handshake request after power-up fails due to insufficient delay, leading to a register access issue. This failure is often accompanied by an "Asynchronous SError Interrupt" kernel panic.
Try connecting the device while holding , Volume Down , or both buttons simultaneously before plugging in the USB. handshaking... error unexpected response 0x68
If the tool supports it, ensure you check the "Disable Authenticator" or "Bypass SLA/DAA Protection" option before plugging in the USB cable.
GSM/LTE modules require significant current bursts during network registration or transmission (often up to 2A for short bursts).
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. The error "handshaking
Driver conflicts are the number one cause of handshaking errors. Disconnect your device. Open your on Windows.
The real nightmare isn’t the byte itself. It’s that 0x68 is often a in certain protocols (like ISO 7816 smart cards). Or the first byte of a multi-byte frame. Or just garbage left in the UART buffer from a previous reset.
Phones stuck in a corrupted boot cycle can generate persistent 0x68 handshake errors until the hardware state is forcibly cycled. Unplug the device from the computer. Primary Cause & Solution He typed again
Toggle your security settings. If you are using ws:// (WebSocket), try switching to wss:// (Secure WebSocket). If you are using http:// , check if the server requires https:// . 3. Kafka Listener Misconfigurations
Use a high-quality data cable and try different USB ports (preferably USB 2.0 if available, as USB 3.0/3.1 can sometimes cause timing issues with these tools).
A TLS handshake can fail for many reasons, such as protocol version mismatches (e.g., client only supports TLS 1.2, but server requires TLS 1.3) or cipher suite incompatibilities. Improper implementation of extensions like ALPN (Application-Layer Protocol Negotiation) can also cause failures. For STARTTLS (used in email), "picky servers" may reject a full data burst, requiring a more nuanced negotiation.
Comprehensive Troubleshooting Guide: Resolving the "Handshaking... Error Unexpected Response 0x68"
If you are testing the module on a breadboard or with loose jumper wires: