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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 .
The *** is a device specific unlock key. flashing lock/oem lock *** – locks an OEM unlocked bootloader. erase – erases a specific partition. reboot – reboots the device into either the main operating system, the system recovery partition or back into its boot loader.
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.
On the Qualcomm MSM8960 for example, the Secondary Bootloader 1 loads the Secondary Bootloader 2. The Secondary Bootloader 2 loads TrustZone and the Secondary Bootloader 3. [9] The SBL is now called XBL by Qualcomm and which is an UEFI implementation. Qualcomm uses LK (Little Kernel) or XBL (eXtensible Bootloader), MediaTek uses Das U-Boot. [1]
Some manufacturers, including Xiaomi, OnePlus, and Motorola, provide official support for unlocking the bootloader, allowing for rooting without exploiting a vulnerability. [46] However, the support may be limited only to certain phones – for example, LG released its bootloader unlock tool only for certain models of its phones. [47]
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.
A Samsung Galaxy A02s booted into recovery mode. 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.
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.