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The settings are only accessible if you use the China server which doesn't even offer the upgrade (reports 2.2.14 is the latest version). Unfortunately due to some latency with another Xiaomi device I own (Xiaomi Bedside Lamp 2), I had to change to the Singapore server, and now the Mi Wifi Repeater 2 settings are yet again inaccessible. All this when using the beta version of the Mi Home app which is updated from time to time, but only advertises advances for those using the China server. So it seams all their development efforts are concentrated to their domestic (Chinese) users.
And this is an old bug, some of the reports are 6+ months old. It's irresponsible and disrespective to treat the international Xiaomi customers in this manner.
Sorry I can't offer a solution, only a frustration for the same problem.