Caution: Please note the upgrade process will wipe out the data on your device. Ensure you take a backup of important data from your device before initiating the upgrade.

Basic Requirements

  • adb and fastbooot should be setup and working on your PC

    To set up adb follow details provided here

  • adb and fastboot need root rights in Linux and administrator rights in Windows.

    In Linux prepend sudo to any adb or fastboot command For e.g. “sudo fastboot reboot” and in Windows start the command window as administrator.

Unlock the bootloader (if locked)

On the device

  1. Enable developer mode
  2. In developer options, tick Allow OEM unlock
  3. Reboot your device on fastboot mode

From your computer

  1. Connect your device to the computer
  2. Run adb reboot bootloader to reboot the device in fastboot mode
  3. Run fastboot flashing unlock to unlock the bootloader
    • Select UNLOCK THE BOOTLOADER with Volume + and valid with Power


  • Download Upgrade Build for the FP3 here

Installing /e/ from the bootloader

Tip: Some of the commands have a -S after them. Please note it is a hyphen ‘-‘ followed by a capital ‘S’ and the value 522239K
  1. Unzip the archive

     unzip <zip>
  2. Wipe user data

     fastboot -w
  3. Install /e/ using the following commands (from fastboot mode)

     fastboot flash system_a system.img -S 522239K
     fastboot flash boot_a boot.img
     fastboot flash vendor_a vendor.img -S 522239K
     fastboot flash dtbo_a dtbo.img
     fastboot flash vbmeta_a vbmeta.img
     fastboot flash system_b system.img -S 522239K
     fastboot flash boot_b boot.img
     fastboot flash vendor_b vendor.img -S 522239K
     fastboot flash dtbo_b dtbo.img
     fastboot flash vbmeta_b vbmeta.img
  4. Relock the bootloader

     fastboot flashing lock
    • Confirm on the device to lock the bootloader.
    • Select LOCK THE BOOTLOADER with Volume + and valid with Power
  5. Enjoy! The device will now reboot automatically on /e/.

Getting a fastboot error ?

  • On some versions of fastboot you may get an error while running the Fastboot flash boot boot.img command

  • The below error may show up on the console

      fastboot error: couldn’t parse partition size ‘0x’
  • A workaround for this error is as under. Run this command on the console:

      fastboot getvar current-slot
  • This would show the current active slot. For e.g. if it shows a , run the below command

      fastboot --set-active=b
      fastboot flash boot_b boot.img