Originally Posted by stegl

I am going to try an educated guess. Are you running two voltages into the receiver? OR the other more likely explanation could be if you have run your servo system that could be the lowest and the highest voltage reading on that receiver power source. the 6.38v could be the voltage at rest. try moving the sticks to make your servos work and see if the larger 6.38 voltage drops a bit. Most program upgrades either have a small readme file that tells you what you have upgraded or some other work file explaining the changes as some sort of attachment file