E122 modem from 3 not working on draytek 2910vg

This modem is listed as supported in firmware version V3.2.5. Has anyone successfully got it working. I tried every configuration I could think of without success.. If anyone has managed to get it work, please let me know how they achieved this.

Also, what firmware might have to be installed. At present I'm using firmware, E122Update_11.009.01.00.1.00.B416, And dashboard, macwin-dash-UTPS11302.09.00.03_mac11.301.10.00.03

Also, the original 3 firmware from three.ie (Ireland) is no longer installed