This behavior of Opera on Android really is annoying. But turning notifications off in Android settings will work for me. I just feel bad for Opera, because they will be alienating non-technical users of their standard Android browser, who may uninstall Opera due to being pestered. Bad decision on Opera's part to do this! What they really should have is a "don't give me this message again" in their tickler, in which case they can successfully promoted Opera Mini at least once, but without pestering users who have seen the info and don't want it repeated.