Admin user/password

Hello,
how to reset admin user and password ?
After I change default user/password its not possible to login again.
Store is currently CLOSED in admin area.

One method:

Create a new temporary install of nop on a dev/test machine - set your choice of password during install.  

Once its installed - copy the password hash from the only customer record in the DB across to the store you need access to.

if you have access of DB you can directly set the PasswordFormat=0 and password for that user so it will work

Create new user.
Now go to MS SQL Server Manager
Get the Id of that customerTable.
Now to go to Customer_CustomerRole_Mapping.
Set a new entry where Customer_Id= that Id and CustomerRole_Id=1;
Now new user become admin.
From new user you can reset password of that admin.

Thank you.