I have managed to get Opera (version 11.50.14 according to the about page) to load TLS 1.2 web pages (including my email) on my phone but I get lots of certificate errors because the roof certificates are likely very out of date.

How can I update those root certificates to something up-to-date so I dont get all the errors?

Although Opera isn't the magic bullet for my N900 web browsing needs, I still can't get the reply text box for threads on www.whirlpool.net.au to show up (either in Opera or Microb) and www.kmart.com.au wont load in Opera even with all the TLS options turned on (it seems to want TLS 1.3 only for some reason).
But its certainly better than the alternative of not having access to any websites that want TLS 1.2