Resolve "Add Warning about FP4 Install Guide"

is_beta: true

oem_unlock_file_name: oem_unlock_FP4

install_e: install_e_FP4

can_rollback: true

can_rollback: false

removable_battery: 1

sim_slots: 2

region: All

before_install_file_name: before_install_FP4

install_e_file_name: install_e_FP4

ignore_troubleshooting_tips: true

requirements_file_name: requirements_FP4

{% include templates/requirements.md %}

{% include alerts/danger.html content="Ensure that you flash an image with a security patch level greater than the level of the existing security patch, Failure to do so will brick your device. " %}

{% include alerts/tip.html content="On your phone you can check the security patch level here `Settings` >> `About Phone` >> `Android Version` >>  `Android security patch level`." %}