Thanks Ted,

So, the app to flash the BB is very simple and fires right up without any installation to speak of. The flash it self was less than 5 minutes and the whole process took 10 minutes I think.

Plugged it back in the car and the settings were still there, just had to turn the phone pairing back on.

Since the two incidents with the LCM "hanging" were quite far apart in time, it will be difficult to know whether this fixed it. At least now my son knows what to do if it happens to him as he is the one who drives the X5 the most.

Unfortunately still have to hook up the BMW OEM microphone I installed..... I got a 6 pin pigtail off Ebay long ago but have sort out the pin-outs and wire it up.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.