I will migrate a Cisco WLAN Controller 2125 to 2504,
So I have one question?
I need to make all configuration into the new Wlan Controller or I can migrate with one tool or something else?
Okay, the ER image is an emergency release and it requires 7-0-235-0.aes. Most likely I'm guessing you uploaded 7-0-235-0.aes rebooted the wlc and then uploaded 7-0-235-0-ER.aes then rebooted again.
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Was the firmware (AireOS) on the 2100 the same as what was in the 2504?
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Okay... well I think Cisco doesn't support it, but it does work. To easiest way to get one config to the other is to take the config from the existing and putting it on the new wlc. Now the new one will be offline, so when you do this, you can always verify that the configuration is identical. Of course the part of the configuration that you will have to change is the hostname, mobility information, maybe ip address. Now you can change this after you upload the config file or you can change it in the gui after the new wlc has the config. All the other configurations should be the same, especially if you are going to and from the same code. I have tested this with the 2100 to 2504 and 4400 to 5508.
So above is how to get the configuration over not migrating over. Now its up to you if the new wlc will have a different ip address so you can setup mobility between the two or just swap it out. Or setup mobility and move the ap's to the new wlc and then change the ip address of the new wlc and remove the old one.