This document provides best practices for upgrading an OCPE device (Tanjay) from build 199 to 522 and then to 6907 using just the Office Communications Server 2007 R2 (OCS 2007 R2) Device Update service.
For those familiar with the process, there is a high level walkthrough in the “OCPE Device Upgrade Steps (Summary Version)” section; otherwise the detailed process begins with the Step 1 in the “OCPE Device Upgrade Steps (Detailed Version)” section.
Great source of information. Very detailed.
My CX700, when upgrading from build 199, correctly fetched the "/RequestHandler/ucdevice.upx" file but then got a httpS link for the download back. Build 199 doesn't seem to be able to connect to https, so in step 1.4 (Modify Device Update Service External
URLs) I had to Change the "ExternalUpdatesDownloadURL" and "ExternalUpdatesStoreURL" from https to http.
This solved the Problem and the CX700 updated successfully from 199! :)