I contacted him and tech support updated his through a chat session.Bully said they have 13' tuning.
I was not trying to be rude, it is just in your first post you did not mention a tuner only the PCM unlock. My apologies for making any assumptions.
I hope you can get the tuner file you need. Best chance is to find a guy with a functioning 13' GT diesel..
As for the closure times, bully isn't quite on the level of avionic/aerospace so not at all surprised they would take some time off. Still best of luck!
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Ha ha I work in aviation but we are operators so we are global 24/7 operation. Many of our vendors though do close. I will be back on Thursday.