Recovery mode
An Android phone can be seen as a device having three main partitions: boot loader, Android ROM, and recovery. Boot loader is present in the first partition and is the first program that runs when the phone is powered on. The primary job of this boot loader is to take care of low-level hardware initialization and to boot into other partitions. It usually loads the Android partition, commonly referred to as Android ROM, by default. Android ROM contains all of the operating system files that are necessary to run the device. The recovery partition, commonly referred to as stock recovery, is the one that is used to delete all user data and files, or to perform system updates.
Both of these operations can be started from the running ...
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