RT-AC68U in Repeater mode with RT-AC5300 not working

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I have the RT-AC5300 (FW: Asus 380.7743), I just purchased the RT-AC68U (FW: Asus 384.10007) to extend the RT-5300 wireless network by using it in Repeater mode, I've tried all the possible combinations, extend the 2.4Ghz or the 5Ghz wireless networks. Nonetheless it has been impossible to make it work, not even once, I always get the messages (screen shot below as well):

"Parent AP status disconnected"
"Unable to connect to parent AP"

Any idea how to get this up and running, I followed all the instructions on the wizard, there is no really any option to make a mistake, everything went through without any problem, I really do not know what else to do, thanks

 

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Problem solved, the new RT-AC68U 384 FW is not compatible with Repeater mode and the 380 FW of the RT-AC-5300, I had to go back to 382 in the AC68 and now it is working. I am going to wait for 384 for the RT-AC5300 and install to both and enable AiMesh