: By default, the RGB LED (WS2812) might require a solder bridge (labeled R68) to be enabled. If left open, GPIO 23 is free for other uses.
: Detailed hardware differences and power schematic analysis can be found on the Raspberry Pi Forums Key Design Features
: Utilizes QSPI Flash (often 4MB or 16MB Winbond chips). The schematic shows the required boot sampling circuit. Clock Source 12 MHz crystal