If the iPad stops responding and you can see in the background that OS has tried to perform an update although automatic updates in the OS settings are disabled, you can currently solve this problem as follows:
If the following URLs are blocked in the firewall, all OS downloads will be blocked and no more updates from Apple will be performed.
appldnld.apple.com
mesu.apple.com
Please note that with this setting no Apple devices, including the iPhone or MacBook, can perform a download in the corresponding network.
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