I just upgraded to an SSD. Bluetooth stopped working!

Well, it' s 2020 and I'm still having the same issue. I just upgraded to an SSD. I have a Late 2015 iMac, after replacing the HD, the Bluetooth stopped working. The wifi and the bluetooth module are one in the same, so I don't understand what is going on.

I took my computer in into the Apple store, cause I claimed it happen after I upgraded to Big Sur, so they said they would look at it for free. They said the module is working fine and they believe it was the logic board which would cost $700 to replace.