Your WIFI name could have been changed to default
Please check if you can find a WIFI name called "Blazing Speed"
This is the default WIFI name
You can change this to your previous WIFI name via Self Care.
Log in and click change WIFI name
Alternatively you can also do it manually following the steps below.(Technical)
TP-LINK
EC440 , ARCHER C1200, EC 230 CLICK HERE
D-LINK
DIR-850 L > CLICK HERE
LINKSYS
EA 6350 > CLICK HERE
HUAWEI
HG8145V5, WA8021V5, HG8145X6> CLICK HERE