diff --git a/Guides/9.UpgradeToLos20.md b/Guides/9.UpgradeToLos20.md
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+# Prepare Upgrade
+
+## On your computer
+
+1. Download and install adb & fastboot
+   1. Windows
+      1. [Download adb & fastboot](https://developer.android.com/studio/releases/platform-tools)
+      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)
+   1. For Linux do `sudo apt install adb fastboot`
+2. Download LineageOS .zip file
+   1. For the [Fairphone 3](https://download.lineageos.org/devices/FP3/builds)
+3. Check your downloaded LineageOS .zip file
+   1. In Windows type `Get-FileHash <lineage_os_filename.zip>` on your computer.
+   1. in Linux type `sha256sum <image_filename.img>` or alternatively `shasum -a 256 <lineage_os_filename.zip>` on your computer.
+
+# 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
+
+1. Navigate to "Settings - About phone"
+1. Tap on “Build number” 7 times to enable developer mode
+1. Navigate to "Settings - System – Advanced – Developer options"
+1. Enable USB Debugging
+
+
+## 3. Connect via usb
+
+For upgrade your Fairphone, it needs to be connected to your pc.
+
+1. Connect your computer & Fairphone via usb
+1. On your Fairphone allow the usb connection
+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`).   
+   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.
+
+1. Allow adb to become root: `adb root`
+1. Now reboot to recovery image: `adb reboot sideload`.
+1. Now upgrade to new LOS version: `adb sideload /path/to/zip`
+1. tap on reboot now.
diff --git a/Guides/Summary.md b/Guides/Summary.md
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--- a/Guides/Summary.md
+++ b/Guides/Summary.md
@@ -1,6 +1,9 @@
+
 1. [Prepare installation](1.%20PrepareInstallation.md)
 2. [Installation LineageOS](2.%20LineageOSInstallation.md)
 3. [Degoogle LineageOS](3.%20DegoogleLineageOS.md)
 4. [Upgrade LineageOS17 to 18](4.%20LineageOSUpgrade.md)
+   1. [Upgrade LineageOS18 to 19](9.UpgradeToLos19.md)
+   2. [Upgrade LineageOS19 to 20](9.UpgradeToLos20.md)
 5. [Backing LineageOS with Seedvault](5.%20LineageOSBackup.md)
 6. [OpenGapps](OpenGapps.md)