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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.
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
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 .
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 ]
Additionally, users must now complete a quiz successfully to apply for bootloader unlocking. The time required for binding the phone has been shortened from 168 hours to 72 hours. [ 15 ] Xiaomi also imposes some restrictions on unlocking the bootloader for regions outside mainland China.
Because Android is based on a modified version of the Linux kernel, rooting an Android device gives similar access to administrative permissions as on Linux or any other Unix-like operating system such as FreeBSD or macOS. Rooting is often performed to overcome limitations that carriers and hardware manufacturers put on some devices.
Root access can be obtained through the use of software exploits (i.e. bugs), through the bootloader console, or over a serial port embedded in the device, such as a JTAG or UART interface. [1] In the case of gaining root privileges on an Android device, the process is known as rooting.
When a system on a chip (SoC) enters suspend to RAM mode, in many cases, the processor is completely off while the RAM is put in self refresh mode. At resume, the boot ROM is executed again and many boot ROMs are able to detect that the SoC was in suspend to RAM and can resume by jumping directly to the kernel which then takes care of powering on again the peripherals which were off and ...