Did you try this:
"if one does accidentally boot into diags mode, what is the easiest way to get out of it?
Good question !
1. Tap on "S) Device settings"
2. Tap on "X) Exit"
3. Tap on "D) Exit, Reboot or Disable diags"
4. Tap on "D) Disable diagnostics"
5. Tap on "Q) To continue""
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