Hi there, @S21ultra 5G. I replied to your PM about this matter. However, just in case you didn't see it, I'll include it here as well.
That's strange that you've been unable to update your S21 Ultra for quite some time. I recommend having a look at the guide below, which contains steps for updating your phone's software via Smart Switch:
https://www.samsung.com/uk/support/mobile-devices/how-to-update-latest-software-for-your-galaxy-mobi...
I expect that this will help. If you go through these steps and still cannot update your phone (a very unlikely scenario), I recommend submitting an Error report:
https://www.samsung.com/uk/support/mobile-devices/how-do-i-use-the-samsung-members-app/.
Submitting an Error report would allow our developers to look into this matter in more granular detail for you.
Please let me know whether you're able to get the latest software update this way
