Sometimes you can't turn them with an Allen key (hexagonal wrench). I cut a groove in the cleat bolts and then unscrewed them with a screwdriver.

Unfortunately the cleat nuts started spinning in the shoe. The Shimano nuts are star shaped that fit into a recess inside the shoe which got worn round by all the torque I was putting on the bolt to undo it. I thought that the shoe was done for but then bought some M5 claw nuts like these
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with spikes. I had to grind the nut down a bit to the Shimano nut height with an angle grinder mounting the nut on a longer M5 bolt, which I held in a vice. In order to grind the nut down one needs to use the grinder upside down so that the spin of the grinder winds the nut onto its supporting bolt rather than off it.

I ground the claws down too, to about 2 mm of claw which digs into the inside of the carbon sole. The claw nut works as a replacement cleat nut. The shoes are now repaired. I also did the same thing with another claw nut to great a Sidi type replaceable heel.

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