Install LineageOS on Fairphone

1. Check your prerequisites on your computer

[ ] adb and fastboot are installed?
[ ] you have downloaded bootimage (img) and LineageOS (zip)?
[ ] you have the unlock code (in case of Fairphone 3)?
[ ] you have a usb cable prepared?
[ ] you are prepared to erase all the data on your fairphone?

2. Unlock your fairphone

Unlocking will allow us to overwrite the boot-loader.

Navigate to "Settings - About phone"
Press 7 times “Build number” to enable Developer mode
Navigate to "Settings - System – Advanced – Developer options"
Enable OEM unlocking with unlock your code
Navigate to "Settings - System – Advanced – Developer options"
Enable USB Debugging

3. Connect via usb

For overwriting your fairphones boot-loader we will need connection to your pc.

Connect your computer & fairphone via usb
On your fairphone allow the usb connection
Type adb devices on your computer. The result should show something like
```
List of devices attached
<SerialNumberOfYourPhone>	device
```

4. Prepare recovery image installation

The next step is the critical one. If this step goes wrong your fairphone may remain broken. Time to do some checks:

Check that your phone has at least 50% battery.
Reboot your fairphone to bootloader mode: Type adb reboot bootloader on your computer.
Fairphone should show the bootloader screen.
Type fastboot devices on your computer. The result should show something like
```
<SerialNumberOfYourPhone>	fastboot
```
Check whether your downloaded recovery image is not broken. In case of
1. windows type Get-FileHash <image_filename.img> on your computer.
2. linux type sha256sum <image_filename.img> on your computer.

The result should look like

b6494278d0a399547a9344a6018a30b388f71a97ef52989bcdd661002f3a8631  lineage-18.1-20210906-recovery-FP3.img

Now compare some random parts of the number to the one given on the recovery image download page. Ensure, you are browsing secure with "https".

5. Install LinegaeOS recovery image

All checks passed? Then lets do the work:

Type on your computer fastboot oem unlock.
Install fastboot image by typing fastboot flash recovery <image_filename.img> on your computer (<image_filename.img> is the img-file you have downloaded in 1.).
Type on your computer fastboot oem lock.

OEM unlocking / locking will erase all data, so we should ensure to do the lock again now.

6. Install LineageOS

This step is no more dangerous. You can retry as often you want to. The LineageOs boot-loader will verify your binaries.

Reboot your fairphone again to bootloader mode: Type adb reboot recovery on your computer.
Your fairphone now boots to the new LineageOS recovery image. Then start the recovery mode.
Choose Factory Reset - Format Data/Factory Reset
Return to main menu
Apply update - Apply from ADB
Type adb sideload <lineagos.zip> on your computer (<lineagos.zip> is the zip-file you have downloaded in 1.).
Check whether you see the Step 2/2 on the bottom of your fairphone.

6.1 Optional installation of Google Apps

If you can't abstain from the Google Apps or the Google Play Store there exist packages with various scopes, you will find a package comparison here: https://github.com/opengapps/opengapps/wiki/Package-Comparison. You have to install Google Aps in front of first the first start wizzard.

Download the favored version from here.
Install the gapps the same way, you installed LineageOs: adb sideload <gapps.zip>

7. Start LineageOS

First start of your new LineageOS - hurray.

Return to main menu
Choose Reboot system, then your phone should start with the new LineageOS.
Walk through the initial LineageOS setup.

8. Download the F-Droid App-Store

For installing more software we recommend F-Droid

Use the browser on your Fairphone to download F-Droid: https://www.f-droid.org/
Visit the download-folder and install F-Droid (accept the warning).
Now you can install Apps like DeltaChat, NextCloud, Fennec, Tusky, k9 (...) through the F-Droid Store.
Open Fennec and install privacy badger as add-on.

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