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: There is an extra user-definable button connected to GPIO 24.
The QSPI traces must be length-matched and kept short. The schematic often includes series termination resistors (22Ω to 33Ω) close to the RP2040 to reduce signal reflections. Additionally, a 100nF decoupling capacitor is placed directly at the flash chip's VCC pin. ydrp2040 schematic
A 12MHz crystal (often HC-49S or small SMD) connects to and XOUT (Pin 24) , with two 18-22pF load capacitors to GND. If your board won’t clock, check these caps first. : There is an extra user-definable button connected