How to setup wireless usb adapter from TP-LINK ?

Hi,

I am trying to install a Wifi USB key from TP-LINK. Here is the reference TL-WDN4200.
I ve found that the used chipset is the RALINK RT3573. So I ve downloaded and installed the associated driver (firmware-ralink).
But after rebooting, no wireless connection is up

Some information to enable to help me:
lsusb:

Zitat

Bus 002 Device 003: ID 148f:3573 Ralink Technology, Corp.

dmesg:

Zitat

[ 2.111364] usb 2-1.6: Product: 802.11 n WLAN
[ 2.111366] usb 2-1.6: Manufacturer: Ralink
[ 2.111367] usb 2-1.6: SerialNumber: 1.0
[ 2.111415] usb 2-1.6: configuration #1 chosen from 1 choice

iwconfig

Zitat

lo no wireless extensions.

eth0 no wireless extensions.

Must I create a new interface in /etc/network/interfaces ?

Thanks for your help.

Zitat von "tekkbebe"

Did you:

modprobe rt3573

Yes, result is: "FATAL: Module rt3573 not found."

Zitat von "tekkbebe"

Then is it available to enable in the interface section of the web gui?

No . Only my wired interface is available.

Zitat von "tekkbebe"

Did you install the backports kernel using the button in OMV Extras?

No. I know nothing about backports kernel :?
Is it an updated version of the linux kernel for OMV ? Must I install it and how ?

So I have updated the kernel ( version: 3.2.0-0.bpo.4-486 ) and the driver (firmware-ralink).
But my wifi USB is not detected again.

Sorry it is a long time that I have managed linux .

How can I check that the driver is loaded or not ? How to load the appropriate driver ?
Thanks for your help