Look for any yellow exclamation marks under Ports (COM & LPT) or Universal Serial Bus controllers .
When linking a Siemens, Allen-Bradley, or Delta PLC to a Variable Frequency Drive (VFD) or smart sensor via RS-485 or RS-232.
The phone is not properly interacting with the PC due to power management issues. How to Fix Handshaking Error 0x68 (Steps) handshaking... error unexpected response 0x68
Verify if the devices are using the correct data bits (usually 8) and stop bits (1 or 2).
Understanding the "Handshaking... Error Unexpected Response 0x68" If you are working with mobile device servicing tools (like UnlockTool ) and encounter the message "Handshaking... Error Unexpected Response 0x68," Look for any yellow exclamation marks under Ports
After three hours, the fix was embarrassing: I forgot to pull a pin high. The peripheral was stuck in bootloader mode, endlessly repeating its device ID ( 0x68 was indeed the first byte of "h" + "ello, I'm in bootloader" ).
Remember that 0x68 is ASCII "h". Look at your server traffic to see if an HTTP response is leaking into a non-HTTP channel. How to Fix Handshaking Error 0x68 (Steps) Verify
Eliminate all interference elements that drop or corrupt data packets during the high-speed data handshake.
: Update drivers, especially for Windows bug checks. If you control the code, add debug output for handshake packets. For timing issues, follow the developer's approach: use a data-driven experiment to find a safe delay.
The "Handshaking... [ERROR] UNEXPECTED RESPONSE: 0x68" message is a common, yet frustrating, roadblock for users attempting to flash, unlock, or repair Xiaomi, Redmi, and POCO devices, particularly those powered by MediaTek (MTK) chipsets.