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Devices should support the locking and unlocking of critical sections, which are defined as whatever is needed to boot the device into the bootloader. If the device supports flashing unlock, then the bootloader should indicate the lock status by setting the kernel command line variable androidboot.įor devices that support dm-verityuse ro. To lock the bootloader and reset the device, run the fastboot flashing lock command on the device. Similarly, unlocked devices should clear RAM at every boot unless this creates an unacceptable delaybut should leave the region used for the kernel's ramoops. This measure prevents attacks that read leftover RAM contents from the previous boot. All RAM not already overwritten should be reset during the fastboot flashing unlock process. Only after a reset can the persistent flag be set so that the device can be reflashed. The bootloader should reset the device even if it can't reformat it properly. After the user acknowledges the warning, the device should perform a factory data reset to prevent unauthorized data access. When the fastboot flashing unlock command is sent, the device should prompt users to warn them that they might encounter problems with unofficial images. After setting, the unlock mode persists across reboots.Īfter setting, this mode persists across reboots and factory data resets. To unlock the bootloader and enable partitions to be reflashed, run the fastboot flashing unlock command on the device. If needed, you and device users with Developer options enabled can unlock the bootloader to flash new images.
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How to use fastboot flash recovery android#
By default, most Android devices ship with a locked bootloader, meaning that users can't flash the bootloader or device partitions.