I have a 775T with software version 3.90 should i update the software and if i do will it correct the volume level on these units i love my unit but i can't use the bluetooth because the volume level at 100% is way to low to here on my car. I drive 10 to 12 hours a day so my car is my office in wheels so bluetooth is very important to me or is there a way to adjust the level in the unit it self