FAQ
Q: When a GPIO pin on Raspberry Pi Pico 2 is configured as a pull-down input and left floating, why does it read as a high level?
A: You can refer to the RP2350-E9 section in the RP2350 Datasheet.
Q: Is the main chip suffix A2 or A4?
A: A4, which fixes the aforementioned RP2350-E9 erratum.