This should work....
To uninstall the console in silent mode
1 In a text editor, create an options file and specify the options you want to uninstall.
-U Uninstalls the product or feature.
2 Run the uninstall program with the -i silent option.
uninstallProgram -i silent -DOPTIONS_FILE=”silentOptionsFilePath”
You must use an absolute path to the options file.
uninstall.exe -i silent -DOPTIONS_ FILE=”C:\tmp\silent_uninstall.txt”
To uninstall a console in silent mode, you have to create one response file as follows,
"BL_Uninstall.exe –a –r –f1<WINDIR>\Temp\Unistall.iss"
*Note- To create response file you have to uninstall Console manually at least once.
Once you are ready with response file you can pass the path to following command
"BL_Uninstall.exe /s /SMS /f1<WINDIR>\Temp\Unistall.iss"
That method doesn't work any more since the installer has changed post 7.6
See new method above.