Hello Flinte,
welcome to the Polycom Community.
According to the Engineering Advisory 64731 Polycom® UC Software 4.0.0: Upgrade and Downgrade Methods => here <= is only applicable to:
This engineering advisory applies to system administrators who plan to upgrade the following Polycom phones to UC Software 4.0.x: Polycom® SoundPoint® IP 321, 331, 335, 450, 550, 560, 650, and 670 desktop phones; Polycom® SoundStation® IP 5000, 6000, and 7000 conference phones; and Polycom® VVX® 1500 business media phones.
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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The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.
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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
