Infinix Mtk Da Auth File (2025)

Mastering the Infinix MTK DA Auth File: The Ultimate Guide to Bypassing SP Flash Tool Authentication Errors

If you have ever tried to flash firmware (ROM) on a modern Infinix smartphone using the SP Flash Tool, you have likely encountered a frustrating roadblock: STATUS_AUTH_FILE_NEEDED or ERROR: S_BROM_DOWNLOAD_DA_FAIL.

This error signals the presence of MediaTek’s Advanced Protection Mechanism, which locks the device’s preloader. The only key to unlock it is the Infinix MTK DA Auth File.

In this 2,500+ word guide, we will dissect everything you need to know about the DA Auth file—what it is, why Infinix and MediaTek use it, how to obtain it legally, and step-by-step instructions to flash your device successfully. Infinix MTK DA Auth File

Steps for Bypass:

  1. Download MTK Bypass Utility (latest v1.9 or higher).
  2. Install Python 3.x and pyserial, usb libraries.
  3. Run bypass.py as Admin.
  4. Connect your powered-off Infinix phone. The script will say "Waiting for device".
  5. Once connected, the script will disable auth (you will see ### DA auth disabled ###).
  6. Without disconnecting, open SP Flash Tool. Load scatter file.
  7. Do NOT load any auth file. Just use a standard DA.
  8. Click Download. The phone will flash normally.

Limitation: This does not work on newer Dimensity chips (MT6893, D900, D1200). Also, some Windows versions require disabling driver signature enforcement.

3.1 File Format

A typical Infinix MTK DA auth file is a binary file (extension .auth or .bin) containing: Mastering the Infinix MTK DA Auth File: The

| Offset | Size (bytes) | Description | |--------|--------------|--------------| | 0x00 | 8 | Magic header (e.g., MTK_AUTH) | | 0x08 | 4 | Version (e.g., 0x00010005) | | 0x0C | 4 | Chipset ID (e.g., 0x8167 for MT6768) | | 0x10 | 4 | Config flags (secure boot, SLA, DAA) | | 0x14 | 256 | RSA-2048 or ECDSA signature (over remainder of file) | | 0x114 | variable | Encrypted token / vendor-specific data |

Why Does Infinix Use DA Auth?

Starting with Android 9 (and especially on Android 10+), MediaTek implemented Secure Boot and DA Authentication to: Steps for Bypass:

Without the correct Auth file, SP Flash Tool will return errors like: