Move AP from WLC 4400 to 2500

Question

I have wlc 4400 running on 6.0.196.0, get new wlc 2500 with 7.0.220.0, on 4400, 12 AP only one will register onto 2500.
Both 4400 and 2500 on the same subnet. how to let AP register on 2500 rather than 4400
AP model:
on 4400 now:  AIR-AP1242AG-A-K9, AIR-LAP1242AG-A-K9, AIR-LAP1142N-A-K9
on 2500 is AIR-LAP1242AG-A-K9

Answer 1

on 4400
(Cisco Controller) >show interface summary
Interface Name                   Port Vlan Id  IP Address      Type    Ap Mgr Guest
ap-manager                       1    untagged 10.10.1.23      Static  Yes    No  
management                     1    untagged 10.10.1.22      Static  No     No  
service-port                      N/A  N/A         10.1.1.10       Static  No     No  
virtual                               N/A  N/A          1.1.1.1         Static  No     No  
on 2500
(Cisco Controller) >show interface summary
Interface Name                   Port Vlan Id  IP Address      Type    Ap Mgr Guest
m2                               2    10       10.10.1.92      Dynamic Yes    No  
m3                               3    10       10.10.1.93      Dynamic Yes    No  
m4                               4    10       10.10.1.94      Dynamic Yes    No  
management                 1    10       10.10.1.90      Static  Yes    No  
virtual                          N/A  N/A      1.1.1.1         Static  No     No