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my S9+ did hotspot work very well untill i upgraded to Android P.
In Oreo i can "use 5 Ghz band when available" under "configure mobile hotspot" but with Pie, this function disappear.
Thanks in advance
Unfortunatly not. :-(
Neither in English, 5ghz option will appear :-(
If you are still searching for an answer, have a look here:https://eu.community.samsung.com/t5/Galaxy-S9-S9/S9-pie-update-hotspot-problems/m-p/1247813#M18724