Fgtech Galletto V54 Low Voltage Problem Solution

I have 2 fgtech galletto 4 v54 master ecu programmers. One worked without issue. And I installed a good herein. It can also start the program, but I can not use.Software warns "LOW VOLTAGE". What could be the problem?

Obdii365 engineer solution:

Do not shut down the Fgtech v54 software program. Keep software running.

Disconnect the fgtech galletto from laptop. 

Reconnect the galletto v54 with laptop via USB cable.

Then the laptop will detect the voltage.