After the July update, every F62 user might be facing a network issue even more. Attached video may help you to fix some of the speed.If you find it helpful, give him a like and subscribe to his channel. It would help him bringing these kind of video...
I'm using Vi. It's working for me with the LTE B8.Before July update I was getting 17mbps.After update it got reduced to 1mbps. Now after following these steps, am getting 9mbps.