#4864, "RE: MS2 config file not found.." In response to In response to 0
Your computer is configured for the standard B&G MS-II code, whereas it needs to be configured for the MS2/Extra code. The error message is telling you your ECU has this MS2/Extra firmware in it, but your computer does not.
To configure TunerStudioMS, make a note of where the firmware package file you just downloaded is. Then, when you create a new project and TunerStudio asks you for the .INI file, navigate to this folder and select the file titled "megasquirt-ii.ini.ms2extra".