Qpst Sahara Memory Dump

QPST (Qualcomm Product Support Tools) is a suite of proprietary utilities from Qualcomm designed for low-level communication with their chipsets. It operates via a diagnostic port (usually COM or /dev/ttyUSB) and allows engineers to flash firmware, change IMEI (in authorized contexts), and—most importantly for this article—execute memory operations.

QPST (Qualcomm Product Support Tools) is a proprietary software suite used to interact with Qualcomm chipsets. Within this suite, the Sahara Protocol serves as the primary transport layer for low-level communication.

Unlike standard USB drivers used by the operating system (Android/Linux), Sahara operates in EDL (Emergency Download Mode) or Sahara Mode. This mode is entered when the primary bootloader is corrupt, the device is "hard-bricked," or specific hardware key combinations are pressed during boot. qpst sahara memory dump

Key Capabilities:

Target: Snapdragon 660 device (Android 10), EDL mode via test point short. QPST (Qualcomm Product Support Tools) is a suite

Command using qcom_ Sahara open-source tool:

sahara -p /dev/ttyUSB0 -d -a 0x80000000 -s 0x20000 -o dump.bin

Result: Successfully dumped 128KB of boot-time memory containing: Attempt to dump TrustZone memory (0x8E000000) → Failed

Attempt to dump TrustZone memory (0x8E000000) → Failed due to Sahara v3 secure policy enabled.

It is important to distinguish the Sahara memory dump from other extraction techniques:

| Method | Access Level | Requires Unlocked Bootloader? | Typical Output | |--------|--------------|-------------------------------|----------------| | ADB backup | OS-level (user) | No | File system | | JTAG | Physical/debug interface | No | Full NAND + RAM | | Sahara/EDL | Boot ROM | No (bypasses lock) | Raw physical memory | | Firehose | Programmer (SBL) | No | Partition-based storage |

Unlike JTAG, Sahara requires no special hardware—only a USB cable. Unlike Firehose, Sahara can access RAM before any secondary bootloader loads, making it uniquely suited for capturing ephemeral data.