Hi! First of all, sorry for my english. I updated to 2.54 firmware and now Helix don't detect any signal from inputs... nothing with guitar in, aux in, sends, returns... nothing. And obviously, the tuner doesn't work too. I upgraded to 2.53 and others versions, but it doesn't work... I HAVE A CONCERT IN A FEW DAYS AND I'M DESESPERATE! Help pls! Thx!