1- I suggest you upgrade your current environment 6.4.4.10 this will make transition a bit smoother to the new controller running the same code version
2- from the HPE support portal transfer the licenses to the new controller and then apply the licenses keys to the new controller
3- if you have any certs installed you will need to transfer those manually since those are not included in the backup
4- perform a backup and restore to the new controller
5- if you keep the same ip for management then all you have to do is unplug the existing controller from the network and plug the new one
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