Add FP4 upgrade guide

cpu: Kryo 570

cpu_cores: '8'

cpu_freq: Upto 2.2 GHz

upgrade_available: S

current_branch:

depth: 10.5 mm (0.41 in)

download_boot: devices.hold_volume_down_power_fairphone_4

bootloader_relocking:

- {vendor: 'Any vendor', supported: 'yes'}

steps_to_flash_file_name: device_upgrade_FP4

{% include alerts/warning.html content="We are testing migration only for /stable package. It should work the same way with /dev, but I strongly advise you to backup all your data before proceeding." %}

### Manually upgrading your {{ device.codename }} to {{ device.upgrade_available }}

1. Download the /e/OS installation package as linked in the `Downloads for the {{ device.codename }} ` section in this guide.

1. Make sure your computer has working `adb`. Setup instructions are linked in the `Basic Requirements` section above

1. Open a console window on your computer. The next set of commands will be run on the console.

{{ adbRoot }}

{%- if device.format_on_upgrade %}

1. Reboot into recovery by running `adb reboot recovery`, or by performing the following:

    * {{ device.recovery_boot }}

1. Wipe your data partition (this is usually named `Wipe`, or `Format`)

    {% include alerts/warning.html content="Without this step your device will not boot on the new version!" %}

{%- if device.uses_twrp != true %}

1. Click `Advanced`, then `Enable ADB`.

{%- endif %}

{%- endif %}

1. Run `adb reboot sideload`.

    {% include alerts/warning.html content="The device may reboot to a blank black screen, this is a known bug on some recoveries, proceed with the instructions." %}

1. Run `adb sideload /path/to/zip` (inserting the path to your /e/OS package).

{% if device.uses_twrp and device.is_ab_device != true %}

1. Once you have installed everything successfully, run `adb reboot`.

{% else %}

1. Once you have installed everything successfully, click the back arrow in the top left of the screen, then `Reboot system now`.

{% endif %}

{% endif %}

[//]: # ( Build type related )

{% if device.codename == "FP4" %}

{% include alerts/danger.html content="You must flash the corresponding build linked below, to manually upgrade from Android R to Android S on your FP4. Upgrading directly to the latest Android S build from Android R will cause a bluetooth database corruption." %}

- [/e/OS S upgrade dev build for dev Android R users](http://images.ecloud.global/dev/FP4/e-1.5.1-s-20221103231515-dev-FP4.zip)

- [/e/OS S upgrade stable build for stable Android R users](http://images.ecloud.global/stable/FP4/e-1.5.1-s-20221102231514-stable-FP4.zip)

{% endif %}

{% if device.codename != "FP4" %}

{% if device.build_version_dev %}

- /e/OS build : [{{ device.build_version_dev }} dev](https://images.ecloud.global/dev/{{ device.codename }}) {{ security_patch }}

{%- endif %}

{% if device.build_version_stable %}

- /e/OS build : [{{ device.build_version_stable }} stable](https://images.ecloud.global/stable/{{ device.codename }}) {{ security_patch }}

{%- endif %}

{%- endif %}

> To understand the difference between /e/OS builds check [this guide](/build-status)