To remove the supervised iPhone state, you first need to understand that the state is set by Device Manager. Usually, supervised iPhones are used in educational institutions or businesses so that administrators can manage these devices remotely. The key to removing this state is to use the Apple Configurator 2 tool, a software that runs on macOS and allows you to restore your iPhone to an unsupervised state. Here are the detailed steps:
Before you begin: Make sure you have a computer running macOS and have Apple Configurator 2 installed in the App Store**.
Back up your data: Since this process will erase all data from your iPhone, it's necessary to make a backup first.
Enter DFU mode: Connect your iPhone to your computer and, depending on the model, put it into DFU (Device Firmware Update) mode.
Use Apple Configurator 2: Open Apple Configurator 2, select your device, and then select the Prepare option. In the next steps, make sure that the "Supervision" option is unchecked.
Restore your iPhone: Follow the on-screen instructions to complete the restoration of your device. This process will erase all data and restore your iPhone to factory settings.
Set up your iPhone again: After your device restarts, you'll need to set up your iPhone again, just like you would if you bought it again.
Note that this method only works for personally-owned devices. If the device belongs to a company or educational institution, you'll need to contact your administrator to get the necessary permissions.