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# Prepare Upgrade
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## On your computer
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1. Download and install adb & fastboot
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1. Windows
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1. [Download adb & fastboot](https://developer.android.com/studio/releases/platform-tools)
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2. It may be necessary to install USB-Drivers by windwos update [see](https://forum.fairphone.com/t/gerat-wird-im-fastboot-mode-nicht-erkannt-os-flashen/42920/2)
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1. For Linux do `sudo apt install adb fastboot`
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2. Download LineageOS .zip file
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1. For the [Fairphone 3](https://download.lineageos.org/devices/FP3/builds)
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3. Check your downloaded LineageOS .zip file
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1. In Windows type `Get-FileHash <lineage_os_filename.zip>` on your computer.
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1. in Linux type `sha256sum <image_filename.img>` or alternatively `shasum -a 256 <lineage_os_filename.zip>` on your computer.
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# Upgrade LineageOS on Fairphone
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## 1. Check your prerequisites on your computer
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[ ] adb and fastboot are installed on your computer?
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[ ] you downloaded LineageOS (zip)?
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[ ] you have an usb cable ready?
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[ ] your phone has at least 70% battery?
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## 2. Enable USB Debugging
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1. Navigate to "Settings - About phone"
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1. Tap on “Build number” 7 times to enable developer mode
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1. Navigate to "Settings - System – Advanced – Developer options"
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1. Enable USB Debugging
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## 3. Connect via usb
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For upgrade your Fairphone, it needs to be connected to your pc.
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1. Connect your computer & Fairphone via usb
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1. On your Fairphone allow the usb connection
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1. 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`).
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The result should show something like
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```
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List of devices attached
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<SerialNumberOfYourPhone> device
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```
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## 4. Upgrade LineageOS
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This step is not very dangerous.
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You will loose your desktop layout but your data should stay safe.
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The LineageOs boot-loader will verify your binaries.
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1. Allow adb to become root: `adb root`
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1. Now reboot to recovery image: `adb reboot sideload`.
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1. Now upgrade to new LOS version: `adb sideload /path/to/zip`
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1. tap on reboot now.
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