After I upgrade my Macbook pro to macOS High Sierra the bluetooth can't work anymore, and it seems on the scanning status all the time, but we can't turn it off, and can't find any bluetooth signal anymore, how can I downgrade my mac, could you please give back the bluetooth on my mac.
MacBook Pro with Retina display, Mac OS X (10.1.x), null
Might be corrupted Bluetooth preferences.
It can happen, "After .. "I upgrade my Macbook pro to macOS High Sierra the bluetooth can't work anymore" ...
Open the Finder. From the Finder menu bar click Go > Go to Folder
Then copy / paste the following:
/Library/Preferences/com.apple.Bluetooth.plist
Then click Go then move com.apple.Bluetooth.plist file to the Trash.
Restart your Mac then check Bluetooth.
Thanks for your suggestion, I tried it just now, but the problem still exists, this way is no effect, thanks anyway.
Thanks all of you, finally I fix this problem with PRAM RET and SMC RET
Erase the disk and restore the backup made prior to the upgrade.
After upgrade to 10.13.4 Bluetooth can't work anymore
