This is probably the router self signed/local certificate rather than an actual problem with the router. Opera normally warns when it can’t verify the certificate, which is common with router admin pages. Since Firefox lets you continue, heck whether Opera for Android has changed how it handles that particular certificate in the latest update. As a workaround, try the router’s HTTP address if it supports it, or use Firefox for these local admin pages. If this started immediately after the Opera update, it’s worth reporting as an Opera Android bug.
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