Thank you very much X423424X. It worked out very nicely. My bluetooth devices are now recognized.
Here are the steps performed on a MacBook Pro 13" OS X Yosemite - 10.10.2 for those who are not familiar with developer tools :
- Install Xcode (you could find it on the apple store).
- In the app, go to : Xcode / Open developer tools / More developer tools…
- A web page opens and you can download Hardware IO Tools for Xcode (my version was for Xcode 6.3 beta 4 - March 24, 2015). You need to register as a Mac developer.
- Open the package and the Bluetooth Explorer.app
- In the app, go to : Tools/Modify Software & Device Configuration
- I checked the first 4 checkboxes that are :
- 'Recant' connected Apple HID devices
- 'Full Factory Reset' Connected Apple HID Devices
- Delete link keys from the Bluetooth module
- Delete global bluetooth preference file
- Click on Perform actions and restart your mac.
Job done, it works. 🙂