You can enable the full CLI with the following command:
<HP 1920G Switch>_cmdline-mode on
All commands can be displayed and executed. Continue? [Y/N]y
Please input password:**********************
Warning: Now you enter an all-command mode for developer’s testing, some commands may affect operation by wrong use, please carefully use it with our engineer’s direction.

the password to enable this:
Jinhua1920unauthorized
or
512900
Hewlett-Packard… really??? (Jinhua is a prefecture-level city in central Zhejiang province in eastern China). You can now (finally) configure your switch with the known comware-commands:

You need to enable the advanced CLI mode on every Telnet/SSH-session. I’m very happy that I discovered this. I hope it helps you a lot!