Updating a B4 machine for the first time

[Cesare Marilungo]

Hi,
I just received a B4 machine and I am a bit puzzled by the info in the 
wiki about updating to the latest build.

The developer console says:
OLPC Build: None.
Firmware: None.

and there isn't any 'olpc-update' script. There's no /security directory 
also.

I have a wireless network (WPA encrypted) which is not seen at the 
moment. So I need to use a Usb key.

I just need to test an activity I'm developing so I guess I can use the 
stable build.

How should I update the machine without risking to brick it?

Thanks in advance.

Cesare

-- 
www.cesaremarilungo.com