1. Type `adb devices` on your terminal (for Windows users: open the terminal in the directory containing adb&fastboot.exe and use the `.\` prefix. The resulting command will be: `.\adb devices`).
1. If your Fairphone reboots, you might have to do the steps 2.1-2.4 again to re-enable USB debugging. Then `adb reboot bootloader` will bring you back.
1. On the terminal type `fastboot flashing unlock`.
2. Install fastboot image & reboot to recovery by typing on the terminal `fastboot flash recovery <image_filename.img>` (<image_filename.img> is the img-file you have downloaded in 1.).
3. Reboot to recovery without starting your original rom: With the device powered off, hold Power + Volume Up. Release when boot logo appears.
3. For Fairphone3
1. On the terminal type `fastboot flashing unlock`.
2. Install fastboot image & reboot to recovery by typing on the terminal `fastboot flash recovery <image_filename.img>` (<image_filename.img> is the img-file you have downloaded in 1.).
3. On the phone you should not see any difference and it should remain in the bootloader screen. Then hold Volume Up + Power. Release when boot logo appears.
4. Reboot to Recovery without starting your original rom:
2. Or use the button method, hold Volume Up + Power. Release when boot logo appears.
4. For Fairphone4
1. On the terminal type `fastboot flashing unlock`.
2. Do the steps 2.1-2.4 again to re-enable USB debugging. Then `adb reboot bootloader`
3. On the terminal type `fastboot flashing unlock_critical`
4. Do the steps 2.1-2.4 again to re-enable USB debugging. Then `adb reboot bootloader`
5. Install fastboot image & reboot to recovery by typing on the terminal `fastboot flash recovery <image_filename.img>` (<image_filename.img> is the img-file you have downloaded in 1.).
Please take care not to boot your old Android / FairphoneOS. If you missed the proper reboot to recovery by buttons you are back to step 1. because your old os reinstalls its own recovery over the one just installed.