HP 1920 switches (and others of the same kind) have a CLI mode which is highly restricted. It is possible to unlock this, providing full access to the configuration of the switch through CLI.
Log on to the CLI (SSH or Telnet) with the admin user and the password (default: none).
Type and press Enter:
_cmdline-mode on All commands can be displayed and executed. Continue? [Y/N]
Press Y to confirm.
Please input password:
Enter the password. This is a firmware-set password and is not user-defined. Depending on the firmware, try one of these:
If successful, you can now run all commands.