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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 .
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 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]
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 ...
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.
Odin is a utility software program developed and used by Samsung internally which is used to communicate with Samsung devices in Odin mode (also called download mode) through the Thor (protocol). It can be used to flash a custom recovery firmware image (as opposed to the stock recovery firmware image) to a Samsung Android device .
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The Primary Bootloader (PBL), which is stored in the Boot ROM [3] is the first stage of the boot process. This code is written by the chipset manufacturer. [4] The PBL verifies the authenticity of the next stage. On Samsung smartphones, the Samsung Secure Boot Key (SSBK) is used by the boot ROM to verify the next stages. [5]