WLC 5508 AP SSO FUS Upgrade with different Versions

Hi everybody,
I've got two 5508 configured as AP SSO and I want to upgrade the FUS to 1.9.0.0
The Image running is 7.6.110.0
On the active controller the FUS Version is 1.3
On the HA-SKU controller the FUS Version is 1.7
Now, can I upgrade the FUS to 1.9.0.0 using the GUI, even when both controllers don't use the same FUS Version? If yes, can I go directly from FUS 1.3 to 1.9.0.0?
thanks a lot,
marc

Unfortunately its not possible to upgrade just the standby controller in a AP SSO setup. The Command "transfer" is not available on the controller with the standby role. :-/
I don't get it, why it's not possible to upgrade either FUS oder Software in a AP SSO setup without downtime. The reason why people use AP SSO is because they have a sensitive wireless environment (24/7) and care about not having some downtime. Hopefully there will give some improvements in future releases in case of downtimes when upgrading.

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