vnx5200 lost id/password

I forgot my admin ID and password to vnx5200.

I don't know because my predecessor didn't record admin ID and password.

I tried all the default ID and passwords that were searched on Google, but they all failed.

Connect the pc to the service LAN port on the vnx.

Successfully accessed https://128.221.1.250:9519 and https://128.221.1.250/setup.

However, there is no place to create a new account, and only the login page is checked.

How shall I do it?

Please help me.