Most devices have the bootloader unlocked.
WILL WIPE YOUR LOCAL PHONE DATA! http://android.stackexchange.com/questions/33691/why-does-unlocking-the-bootloader-wipe-phone
Sony requires unlocking on the website, but allows it for many phones: http://developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader/x
It voids warranty.
It doesn't have to be at the exact same time: if you hold up and insert, it works.
TODO what is the name of this blue light mode? I think it is fastboot mode?
First enter fastboot mode.
Then run:
sudo "$(which fastboot)" devices
# Replace with your unlock code from the website.
sudo "$(which fastboot)" -i 0x0fce oem unlock 0x0000000000000000
Now you can remove the cable, and hold at the same time:
- power
- volume up
- volume down
buttons. And it will enter the boot screen.
Name of an SDK CLI tool and a boot mode.
http://www.androidcentral.com/android-z-what-fastboot
TODO: what is this mode?
Insert computer power USB with sound up button clicked. The status LED turns blue instead of the regular red (charging) / green (charged), and the screen is blank.
TODO adb reboot recovery does not work.
TODO how to enter it?
Official video does not work: https://www.youtube.com/watch?v=TFjvirit24I
Unofficial: https://www.youtube.com/watch?v=I_E9WmBXdV0 Power + Up + Down, then release only Up and press when logo appears.