add FP4 installation procedure

Guides/1. PrepareInstallation.md

@@ -1,4 +1,5 @@
 # Prepare Installation
+
 ## On your computer
 
 1. Download and install adb & fastboot
@@ -11,7 +12,8 @@
    1. For the [Fairphone 3](https://download.lineageos.org/FP3)
 3. Generate unlockcode
    1. In case of Fairphone 2, it is not necessary
-   1. In case of Fairphone 3:
+   1. In case of Fairphone 3 & 4:
+      - Connect your phone with your wifi active
       - Find IMEI number (Settings - About phone)
       - Find serial number (Settings - About phone - Model and Hardware)
       - enter [here](https://www.fairphone.com/en/bootloader-unlocking-code-for-fairphone-3/) and get your unlock code.

Guides/2. LineageOSInstallation.md

@@ -1,18 +1,19 @@
 # Install LineageOS on Fairphone
 
-## 1. Check your prerequisites on your computer
+## 1. Checklist before starting
-[ ] adb and fastboot are installed on your computer?  
+
+[ ] adb and fastboot are installed on the computer?  
 [ ] you downloaded the bootimage (img) and LineageOS (zip)?  
 [ ] you have the unlock code (in case of Fairphone 3)?  
 [ ] you have an usb cable ready?  
-[ ] you have removed your screen lock?   
+[ ] you have removed your screen lock?
-[ ] your phone has at least 70% battery?   
+[ ] your phone has at least 70% battery?
-[ ] you are prepared to erase all the data on your Fairphone?   
+[ ] you are prepared to erase all the data on your Fairphone?
-
 
 ## 2. Unlock your Fairphone
 
 Unlocking will allow us to overwrite the boot-loader.
+
 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"
@@ -21,17 +22,17 @@ Unlocking will allow us to overwrite the boot-loader.
    1. Navigate to "Settings - System – Advanced – Developer options"
    1. Enable OEM unlocking with your unlock code
 
-
 ## 3. Connect via usb
 
 For overwriting the boot-loader of your Fairphone, it needs to be connected to your pc.
-1. Connect your computer & Fairphone via usb
+
+1. Connect your Fairphone to the computer 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`).   
+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`).   
    The result should show something like   
    ```
    List of devices attached
-   <SerialNumberOfYourPhone>	device
+   <SerialNumberOfYourPhone>    device
    ```
 
 ## 4. Prepare recovery image installation
@@ -39,60 +40,63 @@ For overwriting the boot-loader of your Fairphone, it needs to be connected to y
 The next step is critical. If something goes wrong here your Fairphone may remain broken. Time to do some checks:
 
 1. Make sure your phone has at least 70% battery.
-1. Reboot your Fairphone to bootloader mode: Type `adb reboot bootloader` on your computer.
+1. Reboot your Fairphone to bootloader mode: Type `adb reboot bootloader` on the terminal.
 1. Your Fairphone should show the bootloader screen.  
-1. Type `fastboot devices` on your computer. The result should show something like
+1. Type `fastboot devices` on the terminal. The result should show something like   
    ```
-   <SerialNumberOfYourPhone>	fastboot
+   <SerialNumberOfYourPhone>    fastboot
    ```
-1. Check your downloaded recovery image 
+1. Check your downloaded recovery image
-   1. In Windows type `Get-FileHash <image_filename.img>` on your computer.
+   1. In Windows type `Get-FileHash <image_filename.img>` on the terminal.
-   1. in Linux type `sha256sum <image_filename.img>` or alternatively `shasum -a 256 <image_filename.img>` on your computer. 
+   1. in Linux type `sha256sum <image_filename.img>` or alternatively `shasum -a 256 <image_filename.img>` on the terminal.
 1. The result should look like   
    ```
    b6494278d0a399547a9344a6018a30b388f71a97ef52989bcdd661002f3a8631  lineage-18.1-20210906-recovery-FP3.img
    ```
-1. Now compare the number to the one given on the recovery image download page. Ensure you are browsing with "https".   
+1. Now compare the number to the one given on the recovery image download page. Ensure you are browsing with "https".
 [<img src="img/sha256.png" width="500" height="250">](img/sha256.png)
 1. Be aware, in the next step all data will be erased on your Fairphone!
 
 
 ## 5. Install LinegaeOS recovery image
 
-All checks passed? Then lets continues:
+All checks passed? Then let's continue:
-1. On your computer type `fastboot oem unlock`.
+
 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. Install fastboot image & reboot to recovery
+2. For Fairphone2
-   1. For Fairphone2 
+   1. On the terminal type `fastboot flashing unlock`.
-      1. By typing on your computer `fastboot flash recovery <image_filename.img>` (<image_filename.img> is the img-file you have downloaded in 1.).
+   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.).
-   1. For Fairphone3 
+   3. Reboot to recovery without starting your original rom: With the device powered off, hold Power + Volume Up. Release when boot logo appears.
-      1. By typing on your computer `fastboot flash boot <image_filename.img>` (<image_filename.img> is the img-file you have downloaded in 1.).
+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.).
       - If you see something like "boot partition is smaller than boot image" you might find the solution [here](https://gitlab.com/domaindrivenarchitecture/lineageos-Fairphone/-/blob/main/Guides/InstallationFAQ.md).
-      1. 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.
+   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.
-1. Reboot to Recovery without starting your original rom
+   4. Reboot to Recovery without starting your original rom:
-   1. in case of Fairphone2 
-      1. With the device powered off, hold Power + Volume Up. Release when boot logo appears.
-   1. in case of Fairphone3 
       1. Use your bootloader to restart   
       [<img src="img/start.jpg" width="300" height="400">](img/start.jpg)[<img src="img/recovery.jpg" width="300" height="400">](img/recovery.jpg)
-      1. Or use the button method, hold Volume Up + Power. Release when boot logo appears.
+      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`.
-Please take care not to boot in to your old Android / FairphoneOS. If you missed the proper reboot into recovery by buttons you've to step back to step 1. because your old os reinstall its own recovery over the one just installed.
+   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.
 
 ## 6. Install LineageOS
 
-This step is not very dangerous. You can retry as often you need to. 
+This step is not very dangerous. You can retry as often you need to.
 The LineageOs boot-loader will verify your binaries.
 If you are already in the recovery mode you can go to step 6.3.
 
-1. Choose Factory Reset - Format Data/Factory Reset  
+1. Choose Factory Reset - Format Data/Factory Reset   
 [<img src="img/reset.jpg" width="300" height="400">](img/reset.jpg)[<img src="img/format.jpg" width="300" height="400">](img/format.jpg)
 1. Return to main menu
-1. Apply update - Apply from ADB  
+1. Apply update - Apply from ADB   
 [<img src="img/apply.jpg" width="300" height="400">](img/apply.jpg)[<img src="img/sideload.jpg" width="300" height="400">](img/sideload.jpg)
-1. Type `adb sideload <lineagos.zip>` on your computer (<lineagos.zip> is the zip-file you have downloaded in 1.).  
+1. Type `adb sideload <lineagos.zip>` on the terminal (<lineagos.zip> is the zip-file you have downloaded in 1.).   
 [<img src="img/done.jpg" width="300" height="400">](img/done.jpg)  
 
 1. Check whether you see the `Step 2/2` on the bottom of your Fairphone.
@@ -101,6 +105,7 @@ If you are already in the recovery mode you can go to step 6.3.
 ### 6.1 Optional installation of google Apps
 
 If you really need the google Apps or the google Play Store there are packages with various scopes, you will find a package comparison here: [https://github.com/opengapps/opengapps/wiki/Package-Comparison](https://github.com/opengapps/opengapps/wiki/Package-Comparison). You have to install google Apps before the first start.
+
 1. Download your favored version from [here](https://opengapps.org/).
 1. Install gapps the same way, you installed LineageOs: `adb sideload <gapps.zip>`
 
@@ -113,37 +118,43 @@ Then do steps 2.1 - 2.4 again to re-enable USB-debugging and boot again into fas
 
 OEM unlocking / locking will erase all data, so we should ensure to do the lock again now.
 
-1. Type `fastboot devices` on your computer. The result should show something like
+1. Type `fastboot devices` on the terminal. The result should show something like   
    ```
-   <SerialNumberOfYourPhone>	fastboot
+   <SerialNumberOfYourPhone>    fastboot
    ```
-1. On your computer type `fastboot oem lock` and enter.
+2. For Fairphone2
-
+   1. On the terminal type `fastboot flashing lock`.
+3. For Fairphone3
+   1. On the terminal type `fastboot flashing lock`.
+4. For Fairphone4
+   1. OEM lock ist not possible on FP4. You have to use your phone unlocked.
 
 ## 8. Start LineageOS
 
 The first start of your new LineageOS - hurray.
-1. Walk through the initial setup. If you want to avoid tracking from start, you should 
+
+1. Walk through the initial setup. If you want to avoid tracking from start, you should
    1. execute Step 1 - 4 of [DegoogleLineageOS.md](3. DegoogleLineageOS.md)
    2. activate your wifi
 
-
 ## 9. Download the F-Droid App-Store
 
 For installing more software we recommend the F-Droid app store
+
 1. Use the browser on your Fairphone to download F-Droid: [https://www.f-droid.org/](https://www.f-droid.org/)
 1. Visit the download-folder and install F-Droid (accept the warning).
 1. Do no longer trust your browser for installing apps: Settings -> Apps -> Browser -> extended -> switch "Install from unknown source" off.
 1. Now you can install Apps like DeltaChat, NextCloud, Fennec, Tusky, k9 (...) through the F-Droid Store.
 
-
 ## 10. Enable Data-Encryption
 
 Your private data should stay safe in case of loosing your phone
+
 1. Settings -> Privacy -> Trust -> activate encryption (you have to choose at least a screen-lock-pin for this process).
 
 ## 11. Final steps
 
 Now your phone is ready for use
+
 1. Disable Development Options: Settings -> System -> Development Options.
 1. insert your sim-card