Legacy Core Specifications

The specifications below are considered legacy specifications. Use of legacy specifications is allowed, but discouraged. The following specifications contain known errors, some of which will result in interoperability issues with other devices. We urge you to use the most current versions of all our specifications. If you have questions, please submit a ticket.

Legacy Bluetooth Core Specifications

Specification Date Ad​opted Status Date Deprecated
​Core Version 4.1 03 December 2013 Active
Core Specification Addendum (CSA) 4  1 12 February 2013 Active
Core Specification Addendum (CSA) 3  1 24 July 2012 Active
Core Specification Addendum (CSA) 2  1 27 December 2011 Active
Core Version 4.0 30 June 2010 Active
Core Version 3.0 + HS   21 April 2009  Active
Core Specification Addendum (CSA) 1 2 26 June 2008 Active
Core Version 2.1 + EDR 26 July 2007 Active
Core Version 2.0 + EDR​ 05 November 2004 Deprecated 13 November 2014​
Volume 4: HCI Transports 01 January 2006 Active​

 1 Refer to the Mixing of Specification Versions Part for applicability
 2 Applicable to v2.0 + EDR and v2.1 + EDR