Resolved! what behavior will vc do when mismatch version adoptee join the rf-domain?
I got 3 ap7522, A is act as vc, under A's cli, I upgrade firmware on B and C to 7.7.1.12 with:1. upload new firmware 7.7.1.12 to vc: #device-upgrade load-image ap7522 tftp://192.168.9.56/AP7522-7.7.1.12-003R.img device-upgrade rf-domain hkjm ap7522 ...