Once handshake succeeds:
If the problem persists after all above, share:
Then I can give you a device-specific handshake fix.
The "Handshaking Failed" error in MTK (MediaTek) bypass tools like UnlockTool MCT MTK Bypass
typically occurs when the computer and the device fail to establish a stable communication protocol during the Boot ROM (BROM) phase. Direct Fixes for Handshaking Errors Driver Integrity & Reinstallation The most common culprit is a missing or corrupt LibUSB-Win32 MediaTek Preloader : Use a tool like
or the driver installer included with your bypass tool to reinstall the "MediaTek USB Port" driver. Ensure you apply the LibUSB filter
specifically to the device while it is in its "MTK USB Port" state. Physical Connection & Port Stability Handshaking requires a high-speed, stable data link.
: Use a high-quality original USB cable. Avoid using USB hubs or front-panel PC ports; connect the device directly to the motherboard USB ports (the ones at the back of the PC). Correct Boot Key Combination
Devices often fail to handshake if they aren't forced into the correct mode (BROM vs. Preloader). : Power off the phone completely. Press and hold Volume Up + Volume Down
simultaneously while plugging in the USB cable. If that fails, try holding only one volume button or all hardware buttons together. Filter Conflicts Old drivers from different tools can conflict. Control Panel > Device Manager
. Look for "Ports (COM & LPT)." If the device appears briefly and then disappears or shows a yellow warning triangle, right-click and "Uninstall device" (check "Delete driver software"), then start the driver installation fresh. Software Configuration Some modern MTK chips require a "Custom Preloader" to boot.
: In tools like UnlockTool, ensure you have selected the correct model or enabled the "Disable Auth" (Authentication Bypass) option before connecting the device. Common Error Variations Error Message Typical Cause Recommended Fix Protocol: Failed to handshake Incorrect driver filter Reinstall LibUSB-Win32 filter. Booting Device Fail Wrong boot mode or cable Try different button combos; change USB cable. Unexpected Application Error Tool version mismatch Update the tool to the latest version. like UnlockTool or MTKClient?
Troubleshooting “Unexpected Application Error” in Handshake
When the MTK (MediaTek) Bypass Tool or mtkclient fails at the handshaking stage, it typically means the device isn't properly entering BROM mode (Boot Read-Only Memory) or the computer cannot establish a clean low-level connection to the chipset. Quick Fix Checklist
Physical Connection: Try a different high-quality USB cable. Avoid using USB hubs or front-panel ports on a PC; plug directly into the motherboard's rear ports for stable power.
Driver Status: Ensure you have installed the specific Mediatek USB VCOM drivers and LibUSB. Check Windows Device Manager; the device should appear without a yellow exclamation mark as "MediaTek USB Port" or "Preloader".
Battery Level: A low battery can cause the handshake to time out or error. Ensure the phone is charged to at least 30-50%. Correct Connection Procedure
The "Handshake failed" error often occurs because the device is in "Preloader" mode instead of the required "BROM" mode. Power off the phone completely.
Press and hold Volume Up + Volume Down (on some devices, just one of these or all buttons). Connect the USB cable while holding the buttons.
Release the buttons only after the tool successfully bypasses the security. Advanced Troubleshooting
Force Restart: If the device is stuck or "retrying," hold the Power button for 10-15 seconds to force a reset before trying the connection sequence again. mtk bypass tool handshaking error fix
Path Errors: Ensure the tool is in a folder path without spaces or special characters (e.g., use C:\mtk_tool\ rather than C:\Users\My Name\Desktop\Tool\).
Chipset Compatibility: Verify that your specific chipset (e.g., MT6877, MT6833) is actually supported by the version of the tool you are using, as newer chips may require updated payloads.
For a visual walkthrough on resolving handshaking failures specifically in Unlocktool or similar MTK utilities, watch this guide: How To Fix Unlocktool Handshaking Failed Error Fix MOBILE UNLOCK YouTube• Jun 17, 2025
Are you using a specific software like UnlockTool, mtkclient, or the bypass_utility from GitHub? Copiers | Printers | Ink | Toner | Repair from DEX Imaging
Once the handshake succeeds, you will see:
[INFO] Handshake passed. Disabling SLA...
At this point, your tool is "bypassing" security. Keep the tool window open. Now open SP Flash Tool or your preferred flashing software. The device will remain in a vulnerable state for 30-60 seconds. Flash your firmware or perform FRP reset immediately.
If you are reading this, you have likely spent the last hour staring at a red error message in your command prompt. You have the MTK Bypass Tool ready, your device is powered off, you have the USB cable in hand, but instead of a successful bypass, you get the dreaded "Handshaking Error."
In the world of MediaTek (MTK) flashing, unlocking, and FRP (Factory Reset Protection) bypass, the "Handshaking Error" is the single most common roadblock. It is the digital equivalent of extending your hand for a handshake, only for the other person to walk away.
This article is not just a list of potential fixes; it is a diagnostic roadmap. We will explore what the handshaking error actually is, why it happens, and provide 10 proven solutions to get your tool communicating with your device again.
Not all bypass tools support all chips.
Handshaking errors are almost always driver + timing + USB port issues. Start with drivers and USB 2.0, then use mtkclient if the classic bypass tool fails. For very new chips (Dimensity 9000+), only hardware testpoint + mtkclient works reliably.
The "handshaking error" in MTK (MediaTek) bypass tools typically occurs when the software cannot establish a secure connection with the device's BootROM (BROM). This is usually due to driver conflicts, incorrect port selection, or hardware communication issues. Common Causes
Driver Mismatch: The most frequent cause is the absence or corruption of the LibUSB Win32 filter driver.
Port Interference: Other applications (like Samsung Kies or phone managers) may be "grabbing" the MediaTek USB VCOM port first.
DA (Download Agent) Issues: Using an incompatible DA file for the specific chipset.
Hardware Handshake: Faulty USB cables or ports failing to initiate the "handshake" sequence. Step-by-Step Fixes Reinstall LibUSB Filter Drivers Download and open the LibUSB Win32 installer. Select "Install a device filter."
Connect your device in BROM mode (usually by holding Volume Up + Volume Down while plugging in the USB).
Quickly select the MediaTek USB Port or Preloader entry from the list and click Install. Use a Different MTK Bypass Version
If the error persists, try updated versions of popular tools like the MTK Auth Bypass Tool by MCT Team or the MediaTek Universal Tool. Newer versions often include fixes for updated security patches. Check Device Manager Open Device Manager and look under "Ports (COM & LPT)."
If you see "MediaTek USB Port" with a yellow exclamation mark, right-click and select Update Driver -> Browse my computer -> Let me pick -> Choose the MTK USB Port driver manually. Hardware & Connection Check Once handshake succeeds:
Disable Antivirus: Real-time protection can sometimes block the exploit's "handshaking" script.
USB Port: Use a USB 2.0 port rather than USB 3.0/3.1, as the latter can cause timing issues during the handshake.
Cables: Ensure you are using a high-quality data cable, not just a charging cable.
The "Handshaking Failed" error in MediaTek (MTK) bypass tools—such as the MCT Auth Bypass, MTKClient, or UnlockTool—typically occurs when the tool cannot establish a secure connection with the device's Boot ROM (BROM)
. This is almost always caused by driver conflicts or incorrect hardware button combinations during connection. Primary Troubleshooting Steps Disable Driver Signature Enforcement
Windows often blocks the specialized drivers needed for low-level MTK communication. To fix this: Navigate to Update & Security Advanced Startup Restart Now Troubleshoot Advanced Options Startup Settings to "Disable driver signature enforcement". Reinstall your MTK/LibUSB drivers once the PC restarts. Verify Device Connection Mode
The handshake often fails if the device is not in the correct state before plugging it in: : Power off the phone completely. Press and hold Volume Up + Volume Down (or sometimes just one) and connect the USB cable. Preloader Mode
: Connect the USB cable without holding any hardware buttons. If the device is already on, hold the button for 10 seconds to force a reset while connected. Check for "Phantom" Connections
If the log shows a single "Handshake failed, retrying..." message and then stops, it may be a "phantom" output where the tool is attempting to poll other unsupported USB devices. Ensure no other phones, tablets, or controllers are plugged into the PC. Hardware & Port Stability Use USB 2.0 Ports
: Older MTK chipsets often struggle with USB 3.0/3.1 (Blue/Red) ports. Use a USB 2.0 (Black) port or a powered USB hub. Original Cables
: Use the original factory cable or a high-quality data-sync cable. Charging-only cables will fail the handshake immediately. Tools and Resources LibUSB-Win32
: Required for many bypass tools to "filter" the MTK port so the tool can take control of it from Windows. UnlockTool Guide : If using UnlockTool
, ensure the "Auth Bypass" option is selected before connecting the device. MTKClient GitHub
: For technical logs and advanced troubleshooting, refer to the mtkclient issues page If you'd like, let me know: specific tool you are using (e.g., MCT, MTKClient, UnlockTool). phone model (e.g., MT6765). Whether the device is brickled/dead or just being unlocked.
I can then provide specific button combinations or driver links for your device. AI responses may include mistakes. Learn more
Handshake failed, retrying... #44 - bkerler/mtkclient - GitHub
The MTK Bypass Tool "Handshaking Failed" error typically occurs when the software cannot establish a stable communication link with the device’s BootROM (BROM) or Preloader. This is almost always caused by improper driver installation, incorrect device connection timing, or incompatible hardware states. Core Troubleshooting Steps 1. Fix Driver Conflicts (Most Common Cause)
The bypass tool requires specific drivers to "see" the device the moment it enters its short-lived boot mode.
Install LibUSB-Win32: You must use a tool like Zadig or the LibUSB-Win32 filter installer to "filter" the MTK USB Port or MediaTek Preloader USB VCOM port.
Manual VCOM Installation: In Device Manager, ensure your device appears as "MediaTek USB VCOM" under Ports (COM & LPT). If it shows as "Unknown Device" or "MTK USB Port" without a driver, download and install the MTK VCOM Driver manually. If the problem persists after all above, share:
Install UsbDk: For tools like MTKClient on GitHub, installing the UsbDk (USB Development Kit) runtime is often required to handle low-level USB communication. 2. Correct Connection Technique
The window to "handshake" with an MTK device is often less than 2–4 seconds before it proceeds to regular charging or booting.
Force BROM Mode: Power off the phone completely. Hold both Volume Up + Volume Down (or all hardware buttons) and then insert the USB cable while the bypass tool is "Waiting for device".
Battery Pull: For devices with removable batteries, remove the battery, insert the USB cable, and then re-insert the battery to trigger the connection.
Test Point: Newer security patches may disable the button-combo BROM mode. In these cases, you must use a test point (shorting a specific pin on the motherboard to ground) to force the handshake. 3. Software & Environment Fixes
SSL/TLS handshake errors: causes & how to fix Them | Sectigo® Official
Install or reinstall the MTK VCOM USB Preloader Drivers. Use tools like MTK USB Driver to fix "Code 10" or "Handshake failed" errors. Missing UsbDk
Many tools require the UsbDk (USB Development Kit) to filter and capture the device port. Ensure it is installed; without it, the tool may report "Cannot proceed with BROM". Incorrect Connection
For BROM Mode, press and hold Volume Up + Volume Down (or all physical buttons) while connecting the USB. For Preloader Mode, connect without pressing buttons. Faulty USB Path
Avoid using USB hubs or front-panel ports. Connect the device directly to the motherboard's rear USB ports using a high-quality data cable. LibUSB Filter Issues
If using mtkclient, use a filter tool (like Zadig) to ensure the device is being correctly captured by the libusb-win32 driver. Step-by-Step Fix Protocol
Restart the Device: If a handshake fails, the device often gets stuck in a loop. Hold the Power button for 10-15 seconds to hard reset before trying again.
Verify Device Port: Open Device Manager and watch for "MediaTek USB Port" or "MTK USB Port" when connecting. If it appears and disappears quickly, the driver is likely working, but the bypass tool isn't "catching" it fast enough.
Run as Administrator: Ensure the bypass tool (e.g., MCT Bypass, UnlockTool, or SP Flash Tool) is running with Administrator privileges to access system USB ports.
Disable Antivirus: Security software can block the handshake script or the driver installation process. Temporarily disable Real-Time Protection. Advanced Troubleshooting
New Security Patches: For newer MTK security (2023+), standard bypass tools may fail. You may need updated scripts or specific tools like UnlockTool that are frequently updated for newer security headers.
Protocol Mismatch: If the tool reports "Failed to handshake with device," try toggling between "Force BROM" and "Preloader" modes in the tool settings.
REPORT: Technical Analysis and Resolution of Handshaking Errors in MTK Bypass Tools
Date: October 26, 2023 Subject: Troubleshooting and Fixing "Handshake Error" in MTK Bypass Utilities Prepared For: Technical Support / Repair Technicians
Xiaomi phones with MTK processors (Redmi Note 8 Pro, Redmi 9, Redmi 10C) are notorious for this error. Here is the specific workflow for these: