While some manufacturers (most notably Google with its Nexus and Pixel range, Nextbit Robin and a bunch of other developer-friendly devices) allow for unconditional bootloader unlock, others may introduce additional verification steps before allowing the user to unlock. On some (but not all) devices the bootloader can be officially unlocked. If you are a “normal” user or developer, your first step would be unlocking the bootloader. a custom recovery) and use that to image the device by capturing the content of the data partition. On the other hand, if you had an unlocked bootloader, you could run all types of fastboot commands, load a custom boot image (e.g.

With a locked bootloader on Android devices, users are not allowed to modify any system partitions or boot unsigned images (such as a custom recovery) via “fastboot boot” command, or bypass any security-related checks enabled by the OEM. These and other checks occur if the bootloader is locked. If, for any reason, the bootloader’s integrity check of the kernel fails, the device will not continue the boot process, and the user will receive a security check failed warning. As the bootloader is the first thing that gets loaded once the device is powered on, it takes full control of what it will or will not do, permit or restrict what the user can do.Īs the bootloader starts up before anything else on the device, it can perform whatever security checks of the next bootable item in the boot chain, the kernel. In normal OS operation, the bootloader packages instructions to boot the operating system kernel. Bootloader is also responsible for establishing fastboot connection and executing any fastboot commands.

It is this code that chooses a boot partition and hands control to either the regular boot image or the boot image in the recovery partition. In literal terms, bootloader is executable code that loads before the OS. In this article, we’ll concentrate on three things: bootloader lock, encryption, and passcode. Bootloader Lockīefore we go on to the new acquisition method, let us first have a look at Android data protection mechanisms. In this article, we will discuss the latest technique allowing experts to perform bootloader-level imaging and decryption of 2015, 20 Motorola models running Android 5.0 through 7.0.

In this world of increasing security, security firms go out of their way to discover usable techniques for imaging such devices. Equipped with fingerprint readers and compulsory encryption of the data partition, Android smartphones became a much tougher acquisition target compared to just a couple of years ago. Last-generation Android devices are gradually getting more secure, even approaching iOS-grade security in some usage scenarios.

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