LCD buttons not working on AP4450

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We recently installed a AP4450 Automatic transfer switch and eveything seems to be woking fine except for the 3 front panel buttons to navigate through the LCD menu.

We flashed the ATS with firmware version 6.5.6, as well with the latest 7.04. But nothing changes. The LCD is on and seems to be working fine.

Any ideas?

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LCD buttons not working on AP4450

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LCD buttons not working on AP4450

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