Install a MSI US300EX Lite on Ubuntu

Update

This tutorial has stopped working for me but now I got some hints from other readers of my blog. It seems that one has to load the proper firmware first, but I will investigate this further.

These links may be helpful for this topic:
http://wiki.ubuntu.cz/Wi-Fi/Kompilace%20ovlada%C4%8De
http://forum.ubuntuusers.de/topic/installation-msi-wlan-11n-usb-micro-st...

Today I want you to show how to install a MSI WLan US300 EX Lite adapter under Ubuntu Jaunty. It's interesting that under Jaunty the adapter is recognized but won't work as expected: It just can't find my personal Network. A looked into dmesg which showed that the adapter was just searching on channel 1, so I configured my Accesspoint to use the same channel, because I don't know how to switch the adapters channel. Well, this was problem no. 1, but I still can't connect to it, because the connection was always rejected. It must be mentioned that I have no draft n Accesspoint and it's using just WPA. The final solution which works for me, was to grab the driver from the ralink page and compile it myself. Here is the how-to:

1)
download driver from ralink Website
http://eng.ralinktech.com.tw/ (don't forget to switch language to english and go to software->linux and download RT2870USB(RT2870/RT2770). Then decompress it and change directory.

2)
change lines in os/linux/config.mk to

# Support wpa_supplicant
HAS_WPA_SUPPLICANT = y
 
# Support for Native WpaSupplicant Network Maganger
HAS_NATIVE_WPA_SUPPLICANT_SUPPORT = y

3)

sudo make
sudo ifconfig ra0 down
sudo make install

4)
Test it

sudo modprobe rt2870sta

5)
Persist modprobe configuration, open

sudo nano /etc/modules