Are you on windows or Linux?
For Windows, read this.
For Linux, read this and this as well.
These two post go any issues I’ve had on wifi. If you swapped boards and changed the wifi card, please remove the drivers and reinstall. Also, make sure that you have the antenna coaxial connections on tight and proper. If your antenna aren’t connected, then only whatever wifi signals that can reach the tiny nubs on the car are picked up.