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Posts: 18
Registered: ‎09-24-2009
Location: Singapore
Views: 3,344
Message 1 of 2

USB Root Hub (2 ports) - Unknown device

recently i encountered this problem on my T400:


USB Root Hub (2 ports)

- Unknown device

- Thinkpad Bluetooth 


anyone knows what is wrong with this? is there something wrong with my bluetooth device? i tried to remove the unknown device through the device manager but everytime i start my com, there will be this error message.

Currently using windows 7. Does anyone know how i can troubleshoot?



lead_org Microsoft MVP Contributor
Microsoft MVP Contributor
Posts: 21,009
Registered: ‎12-19-2008
Location: Australia, Melbourne
Views: 3,338
Message 2 of 2

Re: USB Root Hub (2 ports) - Unknown device

download Thinkvantage System Update, it should pull down the necessary drivers and update the drivers/software.

Jin Li

May this year, be the year of 'DO'!

I am a volunteer, and not a paid staff of Lenovo or Microsoft

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