Just install firmware. Nothing else. I guess i need firmware rt73.bin. And i have it. but doesn't work. I tried manually add module: modprobe rt73usb, then rtx00usb, rtx00lib and was loaded without errors.
I download rt73 and tried install it, before, tried install linux-firmware all-043.deb, firmware-ralink all.deb. I think problem with modul rt2x00. Dmesg show :
rt2x00lib_request_firmware: Error - failed to request Firmware.
full
usb 2-1.4: Product: 802.11 bg WLAN
usb 2-1.4: Manufacturer: Ralink
usb 2-1.4: reset high-speed USB device number 8 using sw-ehci
ieee80211 phy2: Selected rate control algorithm 'minstrel_ht'
Registered led device: rt73usb-phy2::radio
Registered led device: rt73usb-phy2::assoc
Registered led device: rt73usb-phy2::quality
phy2 -> rt2x00lib_request_firmware: Error - Failed to request Firmware