Hello there! I am Charity, I'm an Independent Advisor. I'm glad to help you today!
My apologies about that. May I ask when you have upgraded your motherboard, have you uninstalled the Bluetooth drivers via device manager, or have you installed new drivers from the manufacturer website?
Kind Regards,
Charity
Please note that things might need more than one reply to completely resolve your issue, as it will completely depend on the complexity of the question and the amount of detail that you have provided me.