Ummm what about newer devices that want to stay on iOS 12?
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Now don't stop signing iOS 12.4.1 because I have to do a DFU install on my 7+
I have the same question. I had updated my SE to 13.1, but it caused my Apple Watch to no longer be able to send messages, so I went back to 12.4.1.
I guess security doesn’t matter on these devices.