Hi nbanda - can you get access to an iPad?- this worked for me..
My Amplifi 75 needed to be updated in order to work with Amplifi Remote on Android.
The Amp connected by Bluetooth to my Android Samsung Pad but Amplifi Remote told me the Amp would have to be updated.
Unfortunately The amp was unable to connect by USB to 3 different Windows 7 computers - so no update via Line 6 Updater software.
As it is currently not possible to update the firmware version of my (new) amp by Bluetooth using android - I had to borrow an iPad and setup the Amplify Remote app so I could carry out the update. (this required the owners passwords etc)
After rebooting my Samsung Tab , the Amplify Remote App was able to see the Amplifi 75, and I finally was able to start using them together.
I was fortunate that I could borrow an iPad, but I suspect that not everyone will be in a position to do this and that I am not alone in having to jump through hoops in order to get the Amplifi 75 to work as advertised.
A real hassle. I suggest that Line 6 should look into this as a matter of urgency with Christmas less than a month away.