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Unlocking the bootloader allows installing and running unsigned code on a device, including user customized software. Operating outside the manufacturer specification might usually result in voiding any warranties and may make the device susceptible to data theft, as the integrity of the operating system (as intended by the manufacturer) can no longer be guaranteed. [1]
The Primary Bootloader (PBL), which is stored in the Boot ROM [3] is the first stage of the boot process. This code is written by the chipset manufacturer. [4] The PBL verifies the authenticity of the next stage. On Samsung smartphones, the Samsung Secure Boot Key (SSBK) is used by the boot ROM to verify the next stages. [5]
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.
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.
Odin is a utility software program developed and used by Samsung internally which is used to communicate with Samsung devices in Odin mode (also called download mode) through the Thor (protocol). It can be used to flash a custom recovery firmware image (as opposed to the stock recovery firmware image) to a Samsung Android device .
The Snapdragon 808 and 810 were announced in April 2014. [79] The Snapdragon 835, announced in November 2017, is the first Qualcomm SOC that is built on a 10 nm architecture. [80] Qualcomm's new flagship chip for 2018, the 845, was announced in December 2017. According to Qualcomm, the 845 is 25-30% faster than the 835.
It is an overclocked version of the Snapdragon 855 providing 10% higher CPU and GPU performance. The Snapdragon 860 was announced on March 22, 2021. It is a pure rebranding of the Snapdragon 855+. The Snapdragon 865 was announced on December 4, 2019. [224] Notable features over its predecessor (855): [225] 2nd-generation 7 nm process [226]
Additionally, certain Samsung devices lack the ability to flash custom software, namely Samsung phones and tablets released in North America after 2015, with an exception for devices lacking a cellular modem, [68] although there are exploits that can unlock the bootloader on some affected devices running older One UI versions.