That is one reason a device like an iPad can never be part of a control system of a certified aircraft. If the manufacturer is going to push out updates, it can effect the reliability of the device, and it would no longer be certified. There is no way Apple would go through the certification process for every update and patch.
So iPads are relegated to a supporting role, acting as the Electronic Flight Bag.
Interesting—thanks for your informative postings to this thread.
When they are using devices in their system, no software should be updated. It’s a lot better to use a stable system and upgrade software and hardware all at the same time ever two or more years. I used the free programmable PDFCreator for a client app, and every time an update was pushed out things broke. Finally stopped the updates and now it’s been flawless.