Hello Patrick,
welcome to the Polycom Community.
BToE is really designed to work with UCS 5.1.1 but should be backwards compatible.
I would suggest your upgrade to UCS 5.1.1 Rev B or downgrade BToE back to 2.1.0 if you want to use UCS 5.0.2
If you are not able to do so please raise a support ticket via your Polycom reseller so our Support team can verify this.
Please be aware of the following when utilizing UCS 4.1.0 or later:
The use of Polycom UC Software versions 4.1.X (“Software”) requires the purchase of a separate Software license for every device that will use the Software in a Lync environment. You may not install, access, or use the Software in a Lync environment on more devices than are listed on your license until additional licenses have been purchased and authorized by Polycom. These licenses should be purchased from the same company from which you purchased the devices. You may operate devices against a Lync server for trial purposes for up to 30 days without purchasing a license. Use of the Software is subject to the terms and conditions of the End User License Agreement.
Polycom reserves the right to audit your deployment to verify that you have sufficient licenses to match the number of devices being used.
Information in regards of License Part Numbers can be found here
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
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