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Still, this code bricks all the Arduino clones (9 instances of Elegoo Smart Robot Car Kit 3.0 Plus) and I spent several hours to find a reliable procedure to unbrick them. Therefore I have strong belief that this code must have undefined behavior - except that I can't see it.

Still, this code bricks all the Arduino clones (9 instances of Elegoo Smart Robot Car Kit 3.0 Plus) and I spent several hours to find a reliable procedure to unbrick them. Therefore I have strong belief that this code must have undefined behavior - except that I can't see it.

Still, this code bricks all the Arduino clones (9 instances of Elegoo Smart Robot Car Kit 3.0 Plus) and I spent several hours to find a reliable procedure to unbrick them. Therefore I have strong belief that this code must have UB - except that I can't see it.

Still, this code bricks all the Arduino clones (9 instances of Elegoo Smart Robot Car Kit 3.0 Plus) and I spent several hours to find a reliable procedure to unbrick them. Therefore I have strong belief that this code must have undefined behavior - except that I can't see it.

Still, this code bricks all the Arduino (clones) and I spent several hours to find a reliable procedure to unbrick them. Therefore I have strong belief that this code must have UB - except that I can't see it.

Still, this code bricks all the Arduino clones (9 instances of Elegoo Smart Robot Car Kit 3.0 Plus) and I spent several hours to find a reliable procedure to unbrick them. Therefore I have strong belief that this code must have UB - except that I can't see it.