If SIM suddenly stoped working after update then you need to change your existing SIM with new one.
First, check the same SIM in other phone (Mostly older), If its working there then its definitely no issue in SIM.
New Android updates along with new phone hardwares are not supporting to old SIM cards (SIMs before 2018)
I also changed my existing SIM with new one recently, It suddenly stops working after an software update in same phone.
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