Huh. MS Edge was useful for something. Tool Won't work with Firefox.

https://handheldlegend.github.io/procon2tool/dumper.html

https://github.com/ndeadly/switch2_controller_research

Dumping Switch 2 WebUSB SPI Memory Dumper.

Joy-Con 2 (R) - PID: 0x2066
Joy-Con 2 (L) - PID: 0x2067
Pro Controller 2 - PID: 0x2069
NSO GameCube Controller - PID: 0x2073

Pro Controller 2 SPI flash at least is 2 MB.

https://github.com/german77/JoyconDriver/blob/master/switch2/command_handler.lua

ColorA = 0x013019, -- 0x3 bytes RGB
ColorB = 0x01301c, -- 0x3 bytes RGB
ColorC = 0x01301f, -- 0x3 bytes RGB
ColorD = 0x013022, -- 0x3 bytes RGB

Pro Controller 2 colors

Color A: 0x232323
Color B: 0xA0A0A0
Color C: 0xE6E6E6
Color D: 0x323232