If the GPT (GUID Partition Table) is destroyed, the PBL looks for bootloaders at specific LBA addresses. If it reads garbage, it triggers the dump.
If you try to flash a phone in QFIL and you see an error log repeating:
Sahara protocol errorMemory dump completed or triggeredDownload Fail: Sahara Fail:QSaharaServer Fail:Process failqpst sahara memory dump upd
Here is the technical breakdown of why this happens:
Once the Sahara server accepts the programmer, the device is now in Firehose Mode. If the GPT (GUID Partition Table) is destroyed,
QPST (Qualcomm Product Support Tools) is a suite of utilities used for communicating with Qualcomm-based devices (smartphones, IoT modules, routers) in emergency download (EDL) mode.
Sahara is a low-level Qualcomm protocol used to: Sahara protocol error Memory dump completed or triggered
A Sahara Memory Dump captures the device’s current memory contents, useful for:
| Tool | Purpose | |------|---------| | EDL Tool (by bkerler) | Cross-platform memory dumping via Sahara + Firehose. | | QDL (Qualcomm Downloader) | Older but stable for legacy chips. | | QFIL (in QPST) | GUI for Sahara + Firehose, limited memory dump. |
A memory dump refers to the process of capturing the contents of a device's memory. This can include data, programs, and system information currently being used or stored. In the context of mobile device repair, a memory dump is often used for diagnostic purposes. It helps technicians understand the device's state, diagnose issues, and sometimes, recover data from a malfunctioning device.
The process of creating a memory dump using QPST and Sahara can serve several purposes: