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After updating in nought video call in imo is silent
Can you go to settings > apps > IMO > force stop > storage > clear data.
Once you have done the above restart the phone and see if you are still experiencing the same issue.
Let me know
I have done all you said, but no result. Same issue.
Unfortunately as this is a third party application we can't guarantee compatibility and it is likely it is not compatible with the latest update.
However, try removing and then reinstalling the application, make sure when you are asked to allow permissions for the application that you tap "allow"
Let me know how this goes