Auth Bypass — Mt6789
Warning: The following is for security research and authorized device recovery only. Unauthorized access violates the CFAA and similar laws.
Requirements:
Process:
Expected output (successful bypass):
MTK Flash/Exploit Client V2.0
Preloader - CPU: MT6789, SLA: Locked
Sending Bypass Payload (wIndex=0xBAAD)...
Bypass OK, Authentication Disabled.
DA sent successfully.
Reading flash ...
The MT6789 BootROM is mask ROM – it is physically etched onto the silicon during manufacturing. It cannot be updated after leaving the fab. This is the cardinal rule of BootROM exploits: they are permanent.
However, MediaTek has responded in three ways: mt6789 auth bypass
For the MediaTek MT6789 (Helio G99) chipset, "auth bypass" is a critical feature used to service modern smartphones from brands like Tecno, Infinix, and Xiaomi. Because this chip often has DAA (Download Agent Authentication) enabled , standard tools cannot communicate with the device without a cryptographically signed payload. Key Tools & Features for MT6789
Several professional tools have implemented specific features to handle the MT6789 security:
TFM Tool Pro MTK (v2.3.0+): This tool introduced "Auth Free" support for MT6789, specifically targeting 2024 security patches for Tecno and Infinix .
Useful Feature: It allows users to perform Reset FRP, Factory Reset, and Flash operations without needing a manual auth file by selecting the brand and chipset directly .
DFT PRO (v5.0.9+): Offers "Latest Security Infinix/Tecno Auth Free" for MT6789 . Warning: The following is for security research and
Useful Feature: It includes a Universal Loader exploit that can bypass RSA Auth, allowing for Bootloader Unlock/Relock and RPMB (Replay Protected Memory Block) read/write operations .
Scorpion Main Tool: Focuses on connection modes for effective bypassing .
Useful Feature: It provides distinct options based on the port detected: use Bypass Auth if the phone is in BROM mode (MediaTek USB Port) and Advanced Auth if it is in Preloader mode . Implementation Advice
If you are looking to utilize or build a feature for this chipset, consider these technical requirements:
Driver Compatibility: Ensure you are using updated MTK drivers that support both BROM and Preloader modes to avoid connection failures seen in older versions . Process:
Mode Detection: A useful feature should automatically detect if a device is in BROM vs. Preloader mode, as the exploit requirements differ between these states .
DA (Download Agent) Handling: For devices where auth cannot be bypassed entirely, a "Custom DA" feature is necessary to load a specific, signed MTK_DA file for the exact model .
Given the specificity and variability of the task, a generic step-by-step guide might look like this:
# Simplified representation using mtkclient's logic
device = mtk.MTK()
device.preloader_connect() # Triggers brom handshake
device.send_da_packet(da_data, is_auth_bypass=True)
# The bypass sets a specific pattern in the USB request's wIndex field
device.usb.ctrl_transfer(bmRequestType=0x40, bRequest=0x02, wValue=0x6789, wIndex=0xBAAD)
device.download_da(da_path="custom_da.bin") # Successfully loads unauthorized DA
Even if the SLA passes, the DA itself (the binary that runs on the SoC to read/write flash) must be signed with MediaTek's private key. DAA ensures that only authorized, unmodified MediaTek agents can execute.
Together, SLA & DAA make traditional "unbricking" or forensic imaging impossible without the manufacturer’s proprietary authentication file (usually an auth_sv5.auth file tied to a specific device or project).
