I have now the latest FW (Merlin 380.61) on my AC68U and the Repeater Mode is now working.
But i have a problem to connect the AC68 in Repeater Mode (5GHZ) with the latest AC87 FW (Quantenne FW 37.4.0.56)
When i take a older FW for AC87 with (Quantenne FW 37.3.0.50) the AC68 is connecting.
I think there is a problem with the newest Quantenne driver on the AC87. MU MIMO support.
@RMerlin Maybe you can make a AC87 380.61 FW with older Quantenne FW 37.3.0.50 for testing if the Repeater Mode is working. We know that the failure comes from Quantenne.