Hello Aravind,
Can you please log in to your bilumira-qa's CMC, then go to Applications -> SAP Lumira -> Properties tab, and check the "SAP BI server" configuration. I believe the URL has been set to http://devservername:6405/bipwrs there.
After setting up the lumiraGovernance.properties file, upon every startup of Lumira Desktop, the application is going to contact the BI Platform via the restful web service url defined in the properties file (in your case it is http://bilumira-qa.xyx.com:6405/biprws) to retrieve Desktop Governance settings, which are defined by your BI Platform administrator in CMC -> Applications -> SAP Lumira -> Properties area.
Therefore, if your admin has defined the SAP BI Server URL to be "http://devservername:6405/bipwrs" in CMC, instead of "http://bilumira-qa.xyx.com:6405/biprws", then your Lumira Desktop Preferences will be overwritten with the value from CMC.
Let me know if you have any questions.
Regards,
Alan