can not reset rt-ac68A/U

Hi,
I really need help as I ran out of options and sorry for the long writing.

I just set up a rt-ac68a as an Aimesh, new RT-AC86A as main router, then I decided to remove the node. So I used the node removal option and performed the reset with the reset button. However, I did not see the default Asus ssids as usual. Then I tried these:

1. Performed the reset multiple times, with reset button and WPS, without any success. I did not see the ASUS and ASUS-5G ssids.
2. After I reconfigured...

can not reset rt-ac68A/U