Hey guys. I am trying to roll back like everyone else on my Ultra units to the 2.55 GLS10 and 18.20 for head units. I tried one of the files I found on here, but it is a PC file and I am using a Mac. Any one out there have it that they wouldn't mind emailing it to me or post it on here. steedamustang04@yahoo.com. Thank you.
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