So I bought my Galaxy S20+(SM-G985F) On ebay. It arrived with Android 10 but rooted, I wasn't able to get auto firmware update and bank apps won't work, Then I flashed it with android 11 CSC:DBT via Odin because it has CSC code WWA/WWA which I can't locate anywhere on the web. Everything was successful except my cellular network is not being registered. There is signal bars and provider info but shows emergency calls only. I have no idea why the phone was rooted at first. It is Impossible to search for operator manually, it stays automatic and gives error searching for network if you try switching off automatic network operator scan. I attached some screen shots. I tried all network error troubleshooting on Google and YouTube already.
Thanks a lot.
just an assumption, but the phone being a rooted version 'might' cause some of the issue settings-wise as updates keep rolling out.
You could try talking to Samsung using their SamsungMembers app... see if they can help get your device as it should be.