My Galaxy S20+5G (model SM-G986B/DS) is stuck with android 11, One UI version 3.1 and won't update since January 2023. My 'Android security patch level' is dated 1st September 2021, which seems very old and my phone doesn't feel secure. I am living in the UK.

I tried Settings>Software update>Download and install, and it says 'Your software is up to date'. Same if I try from the Device Care. I tried installing Samsung Smart Switch on my PC, linked the phone to my PC and it tells me the same thing.

I read that the S20+5G should be able to be updated to One UI 5 with Android 13, but I haven't been able to.

Any suggestions? Thank you very much.