I’ve had this charger for a year now and only used it a couple of times. 2 days ago I upgraded the firmware and now it won’t charge. It shows the voltage of the batteries but no amps. My shunt shows my 2 - 12 volt lithium batteries at 40 percent SOC. All the wiring has been checked for continuity. The 40 amp fuse has been checked as well as the 30 amp fuse on the positive wire. Everything is wired correctly as it did work in the past. All grounds have been checked and are fine. Any help would be appreciated. Thanks.