The idea is to list all known serials from systems with the WUP-10 motherboard rev to hopefully predict how many actually exist. My guess right now is ~5k.

[FJF10520](https://gbatemp.net/threads/looking-for-wii-u-motherboard-revisions.670643/post-10650978)
[FJF105201067](https://imgur.com/a/pX8f53J)
FJF105203 (Console #5740 on https://wiiu.gerbilsoft.com/)
[FJF105218669](https://gbatemp.net/threads/looking-for-wii-u-motherboard-revisions.670643/post-10651449)
[FJF105244507](https://gbatemp.net/threads/looking-for-wii-u-motherboard-revisions.670643/post-10710092)
[FJF105250317](https://imgur.com/a/Hpt5FrZ)
[FJF105258252](https://imgur.com/a/o9RMyxl)