No network after updating Android 11

[Sthesha]

I have just updated my galaxy note 10 Plus which it was rooted using Odin then I lost internet access afterwards So upon trying to update to OS 11 still no internet access how can I restore the internet once More in this situation?

[Joeeye]

Is the phone still accessible in odin?

[BandOfBrothers]

Try a soft reboot by turning your phone Off,  remove the sim card and gently wipe the sims chip and then reinsert and turn back On.

Choose another network in the phone's connection settings and then re choose yours.

Check your Apn's are still correct.

As a process of elimination try your sim card in another phone and then see what happens @Sthesha 

[Ayybee]

For me enable/disable Airplane mode fixed.
Other times, when I accidentally flashed a wrong firmware (un-branded firmware on a branded phone) I would get this error. Installing stock firmware fixed the issue.