Why is my mifi not logging in?

i want to log in to my mifi portal because i dont know username and password, kindly herlp me resolve this

I decided to change my mifi’s admin username and password. The. I tried logging back it and j realized that i have forgotten them. I can’t log back into my admin mifi account...

I logged in and changed my default login details but I can’t remember the new username and password.