Razer Deathadder V2 Pro - problem after updating firmware

Hello, I have a problem with my Razer Deathadder V2 Pro mouse. My product had the v1 firmware and I decided to update to newest one (v2.01.00_r1) by downloading from your site: http://drivers.razersupport.com//index.php?_m=downloads&_a=view&parentcategoryid=1066&pcid=1050&nav=0,76,168,1050 Unfortunately after the update the mouse has frozen and since then it doesn't work over wifi 2.4. It just stopped working, updater said that "Update successful" but i was not even able to click "NEXT" button. Now mouse only works over cable and probably bluetooth (but I don't have this feature on my PC). So probably its problem with dongle ? but how to solve it? is it possible to roll back to first firmware or reinstall newest firmware? Can anyone help me with solving this problem?