Some days ago i tried to read a tune from a car im working on, i couldnt, it was a E38, today i tried to read an E67 and couldnt neither, tried to read a T43 and same results,, it does detect the ECM, read codes, delete codes, log, etc but i cant read the tune.. i did tried to read and tune a LS1B PCM and it did was possible, so i think there is a problem on the software side or the canbus hardware i dont know, but i really need to fix this, how can i diagnose this? have a couple of cars here i really need to tune, any help will be apreciated.