Unable to change name for 5ghz band and password (Connection got installed today)

Messages
78
Location
NA
ISP
Airtel Xstream,
Today airtel fibre got installed at my place. I changed the name of wifi and password via airtel thanks app. The name and password got changed for 2.4ghz band but 5ghz band is showing old name and connecting by old password only. Can anybody provide a solution?
 
login into the router and try to change it.
 

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