What can I do if my iPad freezes / is frozen / unresponsive / shows a black screen?
1. Try to force restart your iPad.
Source: https://support.apple.com/en-sg/guide/ipad/ipad63d30b5a/14.0/ipados/14.0#iPad715e3eec
Force-restarting your iPad can fix a number of issues. If your iPad is unresponsive or slow, do try the above.
What can I do if my iPad is stuck in Mobile Guardian?
If your iPad is stuck in Mobile Guardian, please use your friend's iPad to submit a ticket to us at https://scgssict.freshdesk.com/support/tickets/new
We will help to refresh the device and allow your iPad to leave the Mobile Guardian app.
If you need more help, please submit a ticket to us at https://scgssict.freshdesk.com/support/tickets/new