I used it to register a new battery I put in. I have a 2012 E71 M. I did as you subscribed for a year than cancelled the renew. I think I had to in order to use the register battery function.
as you mentioned in your post it's very easy to use.
At the time I couldn't access the lights computer. And Carly warned me not to access it. Which I didn't. Later on I took it to an Indy shop. He did a software update and the things I wanted to change have been changed. Will Carly access that computer? IDK I have no need to try now.
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