When your screen appears small lock icon in bottom right corner and yu login it appears :SystemMaintain, contact contractors Plz, likes below:

It means you set up Maintain. You need to login by the systemmaintain password. If you login and you can change it by this way:

Then in this page you can fill the systemmaintain password and change the maintainday to 0. Click OK. 

If you forget , it only can be back to the factory. Please contact us.

NOTE: This function is better not to setup. If you forget the password, we can’t solve it and only back to factory. Please notice.