Android – Booting into fastboot mode

During a cold boot, the following key combinations can be used to boot into fastboot mode, which is a mode in the bootloader that can be used to flash the devices:

Device Keys
shamu Press and hold Volume Down, then press and hold Power
fugu Press and hold Power
volantis Press and hold Volume Down, then press and hold Power
hammerhead Press and hold both Volume Up and Volume Down, then press and hold Power
flo Press and hold Volume Down, then press and hold Power
deb Press and hold Volume Down, then press and hold Power
manta Press and hold both Volume Up and Volume Down, then press and hold Power
mako Press and hold Volume Down, then press and hold Power
grouper Press and hold Volume Down, then press and hold Power
tilapia Press and hold Volume Down, then press and hold Power
phantasm Power the device, cover it with one hand after the LEDs light up and until they turn red
maguro Press and hold both Volume Up and Volume Down, then press and hold Power
toro Press and hold both Volume Up and Volume Down, then press and hold Power
toroplus Press and hold both Volume Up and Volume Down, then press and hold Power
panda Press and hold Input, then press Power
wingray Press and hold Volume Down, then press and hold Power
crespo Press and hold Volume Up, then press and hold Power
crespo4g Press and hold Volume Up, then press and hold Power

Also, the command adb reboot bootloader can be used to reboot from Android directly into the bootloader with no key combinations.

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