As mentioned in another thread, and other discussion forums, there is a problem with the Vigor 2850Vn (sometimes) continually rebooting when an Android 4.1.1 device is trying to connect to it. I now have this problem with our Vigor 2850Vn since I upgraded my HTC One X software to Android 4.1.1. There is no such problem with our Vigor 2830Vn.

I have downloaded a beta version of new Vigor 2850Vn firmware yesterday (via an Andoid forum) which is supposed to fix this problem but since that version may not be for the UK, I don't intend to try it.

Is there a fix for a UK Vigor 2850Vn available?

was reading in this forum and the wireless section if you email the UK support they will provide you with a beta guessing for UK modem code firmware that works
http://www.forum.draytek.co.uk/viewtopic.php?f=19&t=17915#p74759