I've recently got two guitar hero live controllers. One synced with no issue whatsoever (just to prove I understand how to sync the guitars!), the second guitar (and yes I have a second dongle for it) when I turn it on, all four lights come on, and then light up one by one. So it refuses to sync. I don't believe anything else is interferring as the first one synced without problem. I've tried putting in different batteries, holding down various buttons and had very little success. I know some people have said it might be because it is an iOS guitar...if this is the case how do I check this? And what are the other options? Is there a hard factory reset or anything I can try?