Wii u pro controller

[raiyoku]

Hi,
I've 2 generic wii u pro conntrollers, one synced well with my raspberry pi3 well, the other didn't want to connect. I played once with the first controller on a Wii U, and since then it refuses to connect on my pi3. How can I connect them again or reset them to make them sync with the pi3 ?
I 'm on the last version of recalbox.

[OyyoDams]

@raiyoku Hi, please don't double post.

https://forum.recalbox.com/topic/9375/manette-wii-u-pro-recalbox-4-1/3