I know support is sending a new EPROM and I hate to dampen your enthusiasm but I don't think that's the problem. If it worked after the firmware upgrade and then suddenly stopped it points to something else. If it's a very old unit, and was shipped via air, then it may be a dead oscillator. We had a problem on early units where the oscillators weren't sealed properly. Shipping via air exacerbated their demise due to the pressure drop causing contaminants to be sucked in. These were Connor-Winfield parts which are supposedly high quality but they had just moved their manufacturing to China. We switched to ECS since then.