HP41CL newbie question

[Neve]

Hi,
I downloaded the new Clupdate program along with the rom_files_171202.zip.
I assume this is the newest update for everything, right? Because I also have the METX.ZIP, PWRX.ZIP and the WARP.ZIP flies.
Now can someone give me a step-by-step howto?
I know how to open a link to the calc. But then what...?
I tried to do a java -jar clupdate-1.1.0.jar —update rom_files_171202.zip /dev/tty.usbserial 4800
And I get:
8192 = 8192 bytes sent
And nothing. The calc returns to 0.0000
And what about the other files I mentioned? What do I do with them??

This may sound obvious to most of you, but I’m really a newbie...

Thanks for your help,