I got a new M4 on Sunday and installed the dev beta 4 without knowing about the bricking issue. It bricked my one-hour-old M4.

The Apple store swapped it out for a new one for me, and I can still install Public or Dev betas on it, but I am too scared to. The non-beta iOS 18 has not been re-released, and I can find no information from Apple or anyone else on the status of the M4s and iOS18. I don't think we will get an official fix until 18.1 is released to the public in mid-October. I am tempted to roll the dice and try 18.1 public beta 2, but I am worried Apple won't replace a second iPad for me.