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Prepare Upgrade

On your computer

Download and install adb & fastboot
1. Windows
  1. Download adb & fastboot
  2. It may be necessary to install USB-Drivers by windwos update see
2. For Linux do sudo apt install adb fastboot
Download LineageOS .img and .zip files
1. For the Fairphone 3

Upgrade LineageOS on Fairphone

1. Check your prerequisites on your computer

[ ] adb and fastboot are installed on your computer?
[ ] you downloaded LineageOS (zip)?
[ ] you have an usb cable ready?
[ ] your phone has at least 70% battery?

2. Enable USB Debugging

Navigate to "Settings - About phone"
Tap on “Build number” 7 times to enable developer mode
Navigate to "Settings - System – Advanced – Developer options"
Enable USB Debugging

3. Connect via usb

For upgrade your Fairphone, it needs to be connected to your pc.

Connect your computer & Fairphone via usb
On your Fairphone allow the usb connection
Type adb devices on your computer (for Windows users: open the terminal in the directory containing adb&fastboot.exe and use the .\ prefix. The resulting command will be: .\adb devices).
The result should show something like
```
List of devices attached
<SerialNumberOfYourPhone>	device
```

4. Upgrade LineageOS

This step is not very dangerous. You will loose your desktop layout but your data should stay safe. The LineageOs boot-loader will verify your binaries.

Allow adb to become root: adb root
Now reboot to recovery image: adb reboot sideload.
Now upgrade to new LOS version: adb sideload /path/to/zip
tap on reboot now.

5. Post upgrade settings

After upgrade you should check some switches and settings.

Setup your desktop layout again.
Reactivate Adress- & Calendar-Sync
Deny networking without NetGuard to being active

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