Samsung band selection new trick working for only some models not for all Samsung toolkit not working for samsung a52 4g for band selection. Plz give solution if any one know

After latest update band selection app not working again .plz any one having the solution plz tell me m in trouble. 

Samsung again remove the band selection. Without bands selection samsung mobile **bleep** 

Samsung band selection not working again any solutione here

Plz bring back the band slection feature.after july update the samsung band selection app not working.with out this app samsung phone is garbage. Why samsung mobile internet is slow in rural area . On the other hand other company mobile with same sim...