The most frequent problem of Use 39″x14″ P5 LED Sign
When you insert USB disk to your sign, you see that!
The buyer doesn’t choose the correct device type and fill the correct resolution.
You need to choose D10 as Device type,don’t choose other or skip.
You need to fill 192(LED ScreenWidth),64(LED screen height) as resolution, don’t fill other value, don’t skip the step.