Lenovo Z2 Plus Android 7 update - Lenovo ZUK Z2 (Plus) Questions & Answers

Hi,
So i got myself a lenovo Z2 Plus 3GB variant, and yesterday i got a notification that an update was available, I then updated to the latest available rom, after updating, the network wont switch from 4G to 3G/2G when others are calling me, so i cant receive any calls or text messages, any ideas on how to solve this problem?
Thanks & Regards
K.Lalrinsanga

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