In this article, I am sharing my knowledge on the topic Understanding the Bootloader Process of android in detail. The Android operating system has a complex and multistage start-up routine. Manufacturers lock the start-up process to protect revenue and maintain control of the device you purchase. The nature of the Android start-up process allows developers and hackers to replace parts of it to achieve full control of an Android device.
Your Android device follows certain steps when booting up. The following steps are simplified and made generic to apply to most Android devices.
1. Special code in the boot read-only memory (ROM) locates the first-stage bootloader and loads it into memory. The boot ROM is an ASIC that has its code permanently programmed.
2. The first-stage bootloader loads the second-stage bootloader after initializing some memory and getting the hardware ready.
The bootloader checks to see if the security flag is on (S – ON). If it is on, then the bootloader will load only signed (official) kernels. If the security flag is off (S-OFF), then the bootloader no longer checks for signatures. Setting S-OFF also releases other security lock downs, making the entire file system writable and enabling other goodies, such as allowing you to install a custom recovery process on the device.
This is the step in which you want your custom bootloader to be loaded. The holy grail of hacking a manufacturer’s handset is to load a custom bootloader so that a custom kernel can be loaded.
Fastboot is a protocol that allows low-level commands to be sent to a device to do such things as write files (such as custom bootloaders, recoveries and ROMs) to the operating system. Most manufacturers, therefore, disable the Fastboot protocol at the factory. Because the second-stage bootloader is the step in the boot process where the
Fastboot protocol is enabled or disabled, this part of the code is frequently encrypted or otherwise locked down by OEMs. Some devices, such as Nexus devices and the Xoom, can be unlocked, allowing the Fastboot protocol to be enabled.
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