Warning: Flashing
your device with a factory image will completely erase all data on the
device so always make a backup of your personal files like pictures, music, sms,
contacts, videos etc. before the flash process.
You can do complete/customize backup of your device using
windows apps like MoboRobo & WonderShare.
Flash at
your own risk!
Flashing Procedure
Flashing a
Google Pixel or Nexus device goes in 3 steps.
- Unlocking Bootloader
- Flashing factory image
- Relocking the Bootloader
1 - Unlocking the bootloader of the device
Make sure
you have the latest version of adb/fastboot tool on your PC. You can extract it
from Android SDK or download it from here
To flash
factory firmware on Pixel and Nexus devices, you have to first unlock the
bootloader of that device.
To unlock
bootloader, first of all you have to put device into fastboot mode either using
key combination or using the adb command:
adb reboot bootloader
Now unlock
the bootloader using either of the following commands:
fastboot flashing unlock (For
devices created in 2015 and later)
fastboot oem unlock (For older devices)
When the
above commands are entered, a prompt screen will appear on your device for you
to confirm the bootloader unlock. Note that this process will erase all data on
device.
Bootloader is
now unlocked.
2 – Flashing factory image
Download the
factory image of the device you want to flash and extract.
Once your bootloader
is unlocked, reboot the device again into fastboot mode.
Launch the
flash-all.bat script file found inside the extracted folder.
This script
will install and update the bootloader, baseband firmware and operating system.
This process
can take about 7 – 15 minutes depending on size of the file.
Once the
installation is done, your device will reboot and all you need to do is set it
up.
3 -
Relocking the bootloader
Once you have
completely restore your device to its factory state, you have to relock the
bootloader again just for security reasons.
Put device
into fastboot mode and use the either of the following commands:
fastboot flashing lock (For devices created in 2015
and later)
fastboot oem lock (For older devices)
Bootloader
is now locked. Not that this process will erase all userdata on the device.
You have now
succeeded in flashing/upgrading your device.
For a list
of Google Nexus and Pixel Factory images, click here
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