I see this has happened to a few people before where you are setting up HA or have setup HA and for some reason when you click on the System services menu it gets stuck on the HA page and won't let you get past it. I have 2 x brand new XGS2300's to configure and I have a RED to setup so I need to get to that page but can't.
I'm on 18.5.2, what was the solution? Use an old firmware?
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