I bought a new ECM for my 2009 GEN four engine. I licensed it which used 2 credits and was able to write my initial tune removing the VATS and DOD. But I?ve made several changes to that tune saving each change as a separate file so I can go back for reference. Now the only file that its allowing me to write to the ECM is the stock file that I read originally and the first revision removing vats and dod, it will not allow me to write any of the additional revisions that I saved, it keeps saying I need to license again? Any words of wisdom would be greatly appreciated. Thank you