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Mobile data setting

So the Advanced Network Manager is showing "NO" or "NONE" for SIM, phone, and network. plus "N/A" for everything else in Cell Information !?

Check the SIM is inserted properly? Do you actually have any carrier service at all? Is your account paid up to date, or have sufficient credit for calls and data? Think you definitely need to contact your carrier about this matter.

Help How to backup phone?

I have Samsung Galaxy Note 8.
What if the update fails and corrupt the phone (e.g. black screen, stuck, unable to access something...)? Is there a way to rollback/uninstall the update?
For example in PC there is a way to full backup and roll back to previous version if the Windows update fails or weird stuff happens after the update, I am thinking of similar backup in Android.
as suggested by @svim , use Samsung's SmartSwitch to backup your phone. you can even save the backup to your computer.

S21Ultra - Battery life getting worse after 1 year?

Some decline in capacity with time is to be expected, though 7% in 1 year seems a little high with protective measures (e.g. the 85% charging limit) in place: that's marginally above what my previous Pixel 2 did with no option to turn fast charging off (except using an old charger) and always charging to 100%. And that was measured by the same app, so hopefully as comparable as such estimates can be between different phones. Of course if you've not been using Accubattery from the start you don't know what the initial capacity estimate was: batteries vary by a few %, and you can get one that's slightly below nominal capacity as well as slightly above, so it's also possible that degradation is overestimated.

The usual thing is to check for any apps that are consistently using more power than they should - something that is complicated by the fact that different apps definitely estimate app usage differently!

Maybe an s21U owner will show up to give a more direct comparison.

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