Resolve "Add warning for OS downgrade"

> **Warning** : Do not attempt to downgrade your smartphone in case you are on Android Q / LOS 17.0 or Android Pie / LOS 16.x.

  > Downgrading a device from Q or Pie to Oreo or Nougat operating system can cause your device to brick and become unusable.

  > If you are on these OS versions Please stop at this point and continue using your current Operating System.

  > The only way you can use /e/OS is if a similar or higher /e/OS build is available for your device.

# Install /e/ on a {{ device.vendor }} {{ device.name }} - "{{ device.codename }}" {%- if device.is_beta %} (beta) {%- endif %}

{% include warning_read_before.md %}

{% if device.type == "phone" or device.type == "Phone" %}

  {% include alerts/warning_prevent_os_downgrade.md %}

{% endif%}

{% if device.before_install %}

{% capture before_install %}templates/{{ device.before_install }}.md{% endcapture %}

## Manually upgrade {{ device.codename }} to {{ device.upgrade_available }}

{% if device.type == "phone" or device.type == "Phone" %}

  {% include alerts/warning_prevent_os_downgrade.md %}

{% endif%}

### Basic Requirements

* adb and fastbooot should be setup and working on your PC

1. If your device is encrypted

   - Ensure you have taken a backup as proposed in step 1

   - Ensure you have taken a backup as proposed in step 2

   - Continue to step 11

1. In TWRP wipe screen on your device click the format data button on the lower side to remove encryption