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Screenshot of Device Manager, containing a Qualcomm device booted in the Emergency Download Mode. The Qualcomm Emergency Download mode, commonly known as Qualcomm EDL mode and officially known as Qualcomm HS-USB QD-Loader 9008 [1] is a feature implemented in the boot ROM of a system on a chip by Qualcomm which can be used to recover bricked smartphones.
The booting process of Android devices starts at the power-on of the SoC (system on a chip) and ends at the visibility of the home screen, or special modes like recovery and fastboot. [ a ] The boot process of devices that run Android is influenced by the firmware design of the SoC manufacturers.
The Android Debug Bridge (commonly abbreviated as adb) is a programming tool used for the debugging of Android-based devices.The daemon on the Android device connects with the server on the host PC over USB or TCP, which connects to the client that is used by the end-user over TCP.
Odin is also used for unbricking certain Android devices. [2] Odin is the Samsung proprietary alternative to Fastboot. There is no account of Samsung ever having officially openly released Odin, [3] though it is mentioned in the developer documents for Samsung Knox SDK [4] and some documents even instruct users to use Odin. [5]
The Android recovery mode is a mode of Android used for installing updates and wipe data. [1] [2] It consists of a Linux kernel with ramdisk on a separate partition from the main Android system. Recovery mode can be useful when a phone is stuck in a bootloop or when it has been infected with malware. [3]
Fastboot is a communication protocol used primarily with Android devices. [1] It is implemented in a command-line interface tool of the same name and as a mode of the bootloader of Android devices. The tool is included with the Android SDK package and used primarily to modify the flash filesystem via a USB connection from a host
The Android Debug Bridge (ADB) is a tool to run commands on a connected Android device. Fastboot is a protocol used for flashing filesystems. Code written in C/C++ can be compiled to ARM, or x86 native code (or their 64-bit variants) using the Android Native Development Kit (NDK).
No drivers are required, but the system functionality is limited until the operating system kernel and drivers are transferred and started. As a result, once the ROM-based booting has completed it is entirely possible to network boot into an operating system that itself does not have the ability to use the network interface.