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An unlocked bootloader, showing additional available options. 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 ...
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 computer. It requires that the device be started in Fastboot mode.
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.
Most devices come with a locked bootloader, which prevents users from installing a new boot image, which is often flashed when rooting a device or using a custom ROM. [25] The bootloader runs on device start-up and is in charge of loading the operating system on the phone. [26]
Some custom ROMs come with TWRP as the default recovery image. TWRP gives users the option to fully back up their device (including bootloader, system data, private applications, etc.) to revert to at any time, and a built-in file manager to delete files that may be causing problems on the device or add some to fix issues.
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.
Custom firmware, also known as aftermarket firmware, is an unofficial new or modified version of firmware created by third parties on devices such as video game consoles, mobile phones, and various embedded device types to provide new features or to unlock hidden functionality.
The boot ROMs of several Texas Instruments systems on a chip support configuring the peripherals through specific pins of the system on a chip. They have many ways to load the first stage bootloader (which is called MLO in the systems on a chip reference manuals): It can be loaded from various storage devices (MMC/SD/eMMC, NAND, etc.).