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I recently picked up the Carly (BMWhat) bluetooth adapter v2.
Works great, takes a while to connect.
Make sure you aren't paired with your car at the same time as this will cause headaches.
You don't actually connect to the bluetooth dongle till the app is started, so don't worry if it doesn't connect and pair like a usual bluetooth device.
Be sure to test with the free demo app before purchase just to see if it works.
I also recommend running your car while doing coding, help keep the voltage stable.
Coded out my warning screens and enabled remember last set for auto start/stop.
After coding changes you have to turn off the engine and restart, which means you have to dig back through the menu's and read from the car again, not a pain by any means but takes a few more seconds.
One thing to note, there are a lot of in app purchases required to get full functionality. This is noted on their website, although poorly. So keep in mind for full app, all unlock+dongle your looking at ~160.
Which isn't too bad, I came from AUDI/VW and most diagnostic tools come in around 250 range, but much more full featured.
IIRC:
iDrive settings: $15 (warning screens)
Battery: $15 (swapping battery reset/register)
Advanced Service: $7.50 (advanced service reset)
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