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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. [2] [3] On Google's Pixel 3, the feature was accidentally shown to users after the phone ...
The Android Bootloader (Aboot or ABL), which implements the fastboot interface. Android Bootloader verifies the authenticity of the boot and recovery partitions. [4] By pressing a specific key combination, devices can also boot in recovery mode. Android Bootloader then transfers control to the Linux kernel.
Team Win Recovery Project (TWRP), pronounced "twerp", [4] is an open-source software custom recovery image for Android-based devices. [5] [6] It provides a touchscreen-enabled interface that allows users to install third-party firmware and back up the current system, functions usually not supported by stock recovery images.
HTC, Google Pixel, and Xiaomi: Power and volume down; Zebra and symbol devices: Right scan/action button; Sony: Power and volume up; Google Nexus: Power, volume up and volume down; On Samsung devices, (excluding the Nexus S and Galaxy Nexus devices), power, volume down and home has to be pressed for entering ODIN mode. This is a proprietary ...
Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing custom firmware . On smartphones , this can be a custom Android distribution or another mobile operating system .
CalyxOS preserves the Android security model, using Android's Verified Boot system of cryptographic signing of the operating system, and running with a locked bootloader. [ 3 ] [ 4 ] CalyxOS also features an installer that guides the user through the process of unlocking and then re-locking the bootloader.
The Google Nexus and Pixel line of devices can have their bootloader unlocked by simply connecting the device to a computer while in bootloader mode and running the Fastboot protocol with the command fastboot oem unlock on older devices, [50] or fastboot flashing unlock on newer devices. [51]
Generally, the phones included on this list contain copyleft software other than the Linux kernel, and minimal closed-source component drivers (see section above). Android -based devices do not appear on this list because of the heavy use of proprietary components , particularly drivers and applications.