I have just bought the Yongnuo YN600EX RT 2 ETTL speedlite flash for Canon and and now wish I hadn't! Having been trying to download and install the recommended firmware update I have now given up. I tried for several hours to download and install the firmware file to my Mac but am defeated at every turn. It is recommended that you open Terminal utility and use that to install. That's scary in itself! So without any help or advice on how to proceed I shall return it. Has anyone any final tips? I have trawled the Internet, watched YouTube and read many "how to's" I am exhausted. Any help would be appreciated before last rites are given! Thanks.