why is my sim card not registering on my phone after system update

[nana_adu]

Please help me uninstall a system update on my BLU XL phone. Because after the update, the phone has been registering a no sim card. Why?? Please help me.

 

[CrBrrr]

Dont update your Phone because if they put a software That is perfect for the Phone then if You update it Will or May cause problems like You have so the answer is downgrade.

 

[tony bag o donuts]

Have you done a master reset or tried your sim card in another device?