When I upgraded to 8.1 I couldn't get a Bluetooth connection and after not being able to resolve the problem I rang Acer Support. The only driver download they could give me was one that I had already installed. They said I would need to take my laptop in for repair. They then said it was an incompatibility issues and I should roll-back to 8 if I wanted Bluetooth. I rolled-back to 8, which took hours, and I have Bluetooth on 8 but I am now hesitant about uppgrading to 8.1 again incase I have the same problem again - even though I have the latest Atheros driver downloads for Bluetooth