GS290 - is there a way to get back to factory Android?

After installation of /e/, when starting the phone, there is a message on the Gigaset start screen, in a very small font:
"Orange state.
"Your device has been unlocked and can’t be trusted
“Your device will boot in 5 seconds”

  • Should that be part of the instructions?
  • Is there a way to get rid of this message and the start-delay it causes?
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