Go to: %programdata%\3CX\Data\Http\Interface\provisioning\ and open the randomly named provisioning directory. Copy all the contents from the .zip files you have downloaded, into the provisioning directory.
Click on the “Phones” node, and select one or more Polycom phones to upgrade the firmware. Click on “Reprovision Phones”. This will send a reprovision command to the Polycom phone.
The Polycom will re-provision and load the new BootRom and Firmware files.