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I have few questions on this and if someone can trace one wire it will really help

 

1. How can you tell if one of these has the updated mother board?

2. On the motherboard, there is a plug for GND and it has two wires coming out where do they go in a correctly wired backshop? One of mine goes to the wall of the building in the front the other wire is loose. Where should it go? 

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