Hello Samsung After the latest July update my note 8 stop working....i was not able to make and receive call also. All functions are working properly except my Sim Card manager.Its showing me that IMEI is unknown after the july security update.I have shown in Samsung care also they told me that you have to change the motherboard.This is not a hardware issue..its definitely software issue.please fix it asap.
Thank you for reaching out. I would be happy to look into this further for you. Can I please have your full model number and IMEI in a private message: http://bit.ly/2JH2rq2