Yep, took two days to do a software upgrade on our 528 as well. They have to download the software for the whole vehicle and reinstall it, not just one module. The whole thing comes as one big ole package. It crapped out the first time thus the run over into the second day.
2006 X3 Silver Grey/Black Lthr/Alum Trim/Sport Prem Pkg/Xenons/Servotronic/Prem Sound/Satellite Radio/Heated Seats/Carbon Fiber Pillars/Blue Tooth/Aux In/Cargo Net/Aluminum Pedals/V1 Hardwired