Wifi problems with antenna -- URGENT

I have a flex 2 14 20404 where the antenna has been replaced but still has the same problem as before where the signal is low even right next to the router. The wifi is also slow (2 hours to download crossy road)

The new part has come of the same model computer so should work.

The wireless card has also been replaced.

Could this be a motherboard problem or a driver issue?

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