Hi,
That should work. However, it will be easier to use the steps highlighted by Victor:
1. Take flashbackup from exisitng master.
Aruba# backup flash
This will create a file viz. flashbackup.tar.gz
Copy out the file to a local machine:
Aruba# copy flash : flashbackup.tar.gz tftp <ip-address of tftp server> flashbackup.tar.gz
Make sure that both the controllers are on the same firmware version.
2. Copy the flashbackup to 7220.
Aruba# copy tftp <ip-address of tftp server> flashbackup.tar.gz flash: flashbackup.tar.gz
3. Install the licenses on the new master.
4. Run the following commands post the above 3 steps:
Aruba# license export license
Aruba# restore flash
Aruba# license import license
Aruba# reload
Note: Please do not execute wr mem while running the above 4 commands
5. Once the controller recovers post reload, edit the port configuration & ensure that ports are showing
as trusted.