Google has updated the user agent string for the AdsBot Mobile Web crawler. Google said if you hard-coded the old user agent string, you will want to make sure to update that in your code. This was updated in the Google crawler documentation. Again, if you have this hard-coded anywhere, make sure to update it.
Link: Google AdsBot Mobile Web Crawler Gets New User Agent String
via http://www.seroundtable.com
Techie.Buzz 