PROBLEM
I turned on my controllers with Start + B as always.
I installed a fresh copy of Recalbox 8.0.2.
I go to Pair a Bluetooth controller, and set the controller to bluetooth pairing mode.
After a few seconds, Recalbox says "No controllers found".
I updated my SN30 Pros to the latest firmware.
I tried setting controllers.bluetooth.ertm=0
as another post said to try. No change.
SOLUTION:
I set controllers.ps3.enabled=0
and it FINALLY WORKED!!
I hope this helps someone else, because I couldn't find how to do this and tried for hours.