There have been several reports of customers complaining that audio is not being transmitted or received on certain Bluetooth headsets. We are aware of two specific headset models: Motorola H500 and Nokia BH-208. Once these headsets have been Paired and Connected to a WORKABOUT PRO G2 (WAPro), an ACL (Data) link is established. But when a call is connected and the SCO (Audio) connection is made, the audio transmitted to or from these headsets fails.
The issue is specific to the firmware on the CSR BlueCore4 A05 Bluetooth Chips and thus only effects WAPro units with HCI/LMP versions 2.1958. The A05 chipsets are only found on WAPro Rev. A MLBs and thus none of the WAPro Rev. B MLBs or Ikons were affected. Since this issue is specific to the Bluetooth HFP (HandsFree Profile), none of the Windows CE devices are affected as they only use the Bluetooth HSP (Headset Profile).
This issue has been solved by disabling the EDR packet types in eSCO on the CSR BlueCore4 A05 chip firmware. A frmware patch compatible with Windows Mobile 6.0 and 6.1 has been released. It and has been packaged in a CAB file:
Apply this patch by running the .cab file. Afterwards, the Bluetooth headset should function as expected. It should not be necessary to restart the device after running the patch. To remove the patch, run BTHeadsetPatch.exe, which would have been installed under Windows/Patches/BTHeadset.
Once the patch is installed, a log file (7527_BTHeadsetPatch.log) will be installed under My Device. This log file will detail the date and time when the patch was installed, the version number and the current status of the patch.