Qpst Sahara Memory Dump ((full))

The QPST Sahara Memory Dump is a forensic and diagnostic process used on Qualcomm-based devices to capture the state of a system's RAM after a crash. This procedure uses the Sahara Protocol , a primary communication method between a Qualcomm device in Emergency Download Mode (EDL) or Debug Mode and a PC. Overview of the Sahara Protocol The Sahara Protocol is a bootloader-level communication interface used by Qualcomm devices. It serves two primary functions: Image Loading : Sending a flash programmer (like a "Firehose" file) to the device's RAM to enable flashing. Memory Debugging : Allowing a PC to read and download the contents of the device's memory after a system crash. How to Capture a Sahara Memory Dump When a device crashes, it often enters a "Dump Mode" or "Qualcomm Crashdump Mode". You can capture the memory state using the following steps: Identify the Crash State : A device in crash mode may show a "Qualcomm Crashdump Mode" screen or appear as a Qualcomm HS-USB Diagnostics (9006) port in Windows Device Manager. Automatic Capture via QPST : Open the QPST Configuration Tool. When a crashed device is connected, QPST should automatically detect the port and prompt to save the dump files. The tool will typically request a location on your PC to store the resulting .bin or .elf dump segments. Alternative Command Line Tools : Tools like qdl or edl (Inofficial Qualcomm Tool) can be used on Linux/Windows to manually trigger reads from Sahara-enabled devices. Use commands like edl rf flash.bin to dump the whole flash or specific partitions for forensic analysis. Structure of the Memory Dump A standard Sahara memory dump is often organized as a table of memory addresses provided by the device during the "Hello" handshake. Included Data : User-mode and kernel-mode memory, registers, and system state at the moment of the crash. Excluded Data : Memory protected by the Trusted Execution Environment (TEE) or secure zones, which are typically inaccessible via Sahara for security reasons. Analysis and Troubleshooting Parsing the Log : To make sense of the .bin files, you generally need the symbol table matching the specific firmware version that was running at the time of the crash. Common Error - "Sahara Fail" : This error often occurs when there is a mismatch between the programmer file and the device hardware, or if the device is not correctly in EDL mode. Recovery : If you are stuck in Crashdump Mode and do not need the data, you can often force a reboot using volume and power button combinations, or use QFIL (Qualcomm Flash Image Loader) to reflash stock firmware. Are you trying to recover a bricked device , or are you performing forensic analysis on an existing memory dump?

Technical Report: QPST Sahara Memory Dump Analysis Report ID: TIR-MDM-2026-01 Subject: Qualcomm QPST Sahara Protocol Memory Dump Date: April 19, 2026 Author: Embedded Systems Security Team 1. Executive Summary The Sahara Memory Dump functionality within Qualcomm’s QPST (Qualcomm Product Support Tools) is a low-level diagnostic feature used to extract raw memory contents from a device’s processor over a serial or USB interface. Primarily intended for engineering and failure analysis, this protocol operates before the main operating system (Android, Windows on ARM, etc.) boots. While invaluable for debugging hardware faults, boot failures, and security research, the Sahara memory dump also presents significant data leakage risks, as it can expose sensitive assets (e.g., cryptographic keys, bootloaders, secure world memory) without authentication. 2. Background: QPST and Sahara Protocol 2.1 QPST Suite QPST is a proprietary software suite from Qualcomm for communicating with Qualcomm-based chipsets (MSM, Snapdragon). It includes tools like:

QPST Configuration Software Download (for flashing firmware) Memory Debug Application EFS Explorer

2.2 Sahara Protocol Sahara is a low-level, streaming protocol used for early boot-time communication between a host PC and a Qualcomm device in Emergency Download (EDL) Mode . It allows: qpst sahara memory dump

Loading programmable bootloaders (e.g., MPRG, SBL) Reading/writing flash partitions Executing diagnostic commands Dumping physical memory (RAM, sometimes registers)

The protocol version (e.g., Sahara v1, v2, v3) dictates features like secure negotiation and authentication. 3. Sahara Memory Dump – Technical Details 3.1 How It Works

Device enters EDL mode (via key combination, corrupted bootloader, or forced JTAG command). Host sends Sahara “Hello” command (magic packet 0xDEADBE00 ). Device responds with supported protocol version and max packet size. Host requests memory dump using specific Sahara commands: The QPST Sahara Memory Dump is a forensic

0x10 – Read Memory (address, length) 0x12 – Dump Physical Memory (if enabled in boot ROM)

Device streams back raw binary data of requested memory ranges. Host reconstructs dump into a .mbn , .bin , or .dump file.

3.2 Typical Memory Ranges Dumped | Region | Description | Sensitivity | |--------|-------------|--------------| | Boot ROM (mask ROM) | Immutable boot code | Low | | On-chip RAM (OCIMEM) | Early boot stack, certificates | High | | DDR SDRAM | Full system RAM (if dumped post-boot) | Critical | | TZ (TrustZone) memory | Secure OS, keys, DRM | Extremely High | | Modem memory | Baseband firmware, IMEI, radio calibration | High | 3.3 Command Sequence Example (Sahara v2) HOST -> DEV: HELLO (0x01, ver=2, mode=0x01) DEV -> HOST: HELLO_RESP (0x02, status=0, ver=2) HOST -> DEV: READ_MEMORY (0x10, addr=0x80000000, len=0x1000) DEV -> HOST: DATA (0x12, len=0x1000, <binary>) HOST -> DEV: DONE (0x04) It serves two primary functions: Image Loading :

4. Use Cases 4.1 Legitimate Engineering Use

Boot failure analysis – Dump early boot logs from on-chip RAM after a hang. Security research – Analyze TrustZone or hypervisor memory. Firmware recovery – Extract partial firmware from bricked devices. Forensic acquisition – Obtain RAM contents when OS is unresponsive.