Hi I trying to upgrade the firmware for out VigorPro 5510 Series.

I downloaded the latest version [ VigorPro5510_3.3.6.3.zip }
logged into my router and tried upgrading the firmware and I received an error message saying bad firmware please update firmware router will shut down. I had to reboot the router

I tried using the router tools FRMugp.exe this didn't work either can anyone offer any advise

I don't have a 5510, but try unzipping the download?

Perhaps you have tried an incomparable firmware
The right one is here (guessing this is your model)
http://www.draytek.com/index.php?option=com_k2&view=item&id=2510&Itemid=3790&lang=en#downloads
Try a master reset (should had from before a backup file for cases like this)
Then try load the firmware again
If not works try different browser
If still not success try the firmware utility tool 3.6.5
http://www.draytek.com/index.php?option=com_jumi&view=application&fileid=17&Itemid=586&lang=en
here a guide may helps you
http://www.draytek.com/index.php?option=com_k2&view=item&id=1215&Itemid=293&lang=en