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Title: Flashing Firmware on MediaTek MT6765 (Helio P35): A Technical Analysis of SP Flash Tool Protocols, Security, and Failure Recovery

Abstract:
The MediaTek MT6765 (Helio P35) is a widely utilized octa-core System-on-Chip (SoC) for budget and mid-range smartphones. Restoring or modifying its firmware requires the proprietary Smart Phone Flash Tool (SP Flash Tool). This paper examines the architecture of SP Flash Tool v5.x, its low-level communication protocol via USB (PreLoader and BootROM stages), the partition layout of the MT6765 (including preloader, lk, boot, and system), and common failure mechanisms (e.g., STATUS_BROM_CMD_SEND_DA_FAIL, S_BROM_DOWNLOAD_DA_FAIL). We also analyze bypass methods for SLA (Secure Level Authentication) and DAA (Download Agent Authentication) on this specific chipset.

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  1. Driver Installation: The computer must have the correct MediaTek VCOM or Preloader drivers installed. Without these, the computer cannot recognize the device when it is plugged in while powered off.
  2. DA and Auth Handling: Many MT6765 devices, particularly those from Transsion Holdings (Tecno, Infinix) or Xiaomi, require a specific Download Agent and an Authentication file. The user must load these into the SP Flash Tool "Config" or "Download" tabs to bypass the device's handshake security.
  3. The Handshake: The user loads the Scatter File into the tool, selects the desired partitions, and clicks "Download." The device must be turned off (battery connected) and connected via USB. The tool detects the Preloader's handshake, uploads the Download Agent, and proceeds to write the partition images.

Unbricking: Revive "dead" devices by flashing the correct preloader and system files. Critical Usage Notes Title: Flashing Firmware on MediaTek MT6765 (Helio P35):