Is there any way i can downgrade the the network firmware on my device without deleting the data because i tried everything . Before nothing os 3.0 the 5g data speed was good but after the update only good internet speed when i switch back to 4g data only. Tried contacting nothing team but they keep sending the same method again and again which i tried multiple time . Every member in my house use jio sim they get good 5g speed but not me i even tried contacting the operator and they told me may be its the issue of my device.
