you have to register to CSR site and download “CSR BlueSuite” then use DFUWizard
Please remember to send unit in dfu mode sending “dfu” command by a terminal before starting DFUwizard
You need to use the Search feature once you are registered, and search for “BlueSuite”. This will list the different BlueSuite releases as well as the documentation for the software.
thank you very much for your reply. I have found the BlueSuite software in this website csrsupport.com/ and will try to upgrade my BC127 firmware ASAP.