UI8/Android 16 update SIM not recognized.

[bwrite]

Galaxy S21FE 

After updating yesterday to Android 16/UI 8, my SIM card is no longer recognized. 

My phone tells me to insert a SIM card when 8 try and turn mobile networks on my phone diagnostics say the SIM card is good, just can't connect to a network. 

I can't make any changes as the 'Access Point Names' and 'Network Operators' are greyed out.

Also, when I go to check for system update it says there's no info about the latest update... And I get an error message if I try and run a check...

Did my update somehow get botched? His so I force a re-update?

I switched from Verizon to Mint Mobile 6 months ago, and this is my first major update since. but I bought the phone already unlocked. Did this update somehow reset it? Why can't I make changes like I did when I switched networks?

Will a factory reset get me around this? (Able to modify my access point and network?)

Desperate to not buy a new phone just yet 🥺

[bwrite]

Screenshots

[MelissaSchaefer79]

Try an E Sim. My sim card did the same!!!! An esim fixed it

[bwrite]

Unfortunately the S21FE doesn't work with eSIM 😔

[ESCLAPEZ]

I've got the same problem with my samsung A536U1. As I live in France Samsung France can't help me because my phone is a US version.

And my cellphone is not compatible with esim. Help !!!

[MarvinMod2]

Pull the sim card and put it in a known good working device. Verify the sim is working. Place sim back in trouble device while powered off then turn on. If problem still persist, try re flashing the firmware via smart switch or odin.

https://www.samsung.com/latin_en/support/mobile-devices/how-to-fix-the-no-sim-card-detected-error-on...

[Billtodd]

My galaxy A53 has exactly same problem. Sim works fine in my S6 but is not even recognised after the update on A53

How do I  reverse update and switch off further Samsung updates?

[Shortmic]

Same with my A53

[Emmstein]

Same with my A53, please Samsung do something fast!!

[rickla]

Another A53 now a brick after UI8 update because it no longer recognizes a perfectly good sim card