Your stock tune is based on your particular car's strategy code. Loading someone else's stock tune would not work unless their strategy code is the same. If you call SCT when they are open, they can help you. I had a similar issue once and they got me going.
Were you able to get your issue resolved? Were they able to help you with the stock file? I need my stock tune file as well lol. I'm 100% I pulled it from the device before it failed on me but I cannot find the file at all.