In asp.net the 51degree is not detecting new useragent.
User-Agent: Mozilla/5.0 (Linux; U; Android 4.0.3; en-us; EVO Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
How can I ensure that new mobiles are also detected?
The 51degree have their database into a zip, and encoded file. There is no way you can add this User-Agent by your self , you need to contact them and ask them to add it.
Or use other method (with less features) like: Mobile Device Detection in asp.net