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The only way I can think round this would be:
1 Create 3 folders on USB (e.g. Disk1, Disk2, Disk3)
2 Copy contents of 3 ISO's into their respective folders
3 Move contents of Disk1 to root of USB and start upgrade
4 When Prompted for next one, take out USB and move files from the root folder back to Disk1 and move contents of Disk2 to root folder (using Laptop or similar)
5 Same for Disk3
This would still require you take a laptop out to the car to do the install but at least you only need one USB stick and also the moving of files within the USB is instantaneous compared to copying files.
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Last: 330cd Sport - Silver Grey, 335d M Sport Coupe, F10 535d M Sport.
Current: AW F21 M135i, Coral Red, Pro Nav, Vis, HK, & Clunky Adaptive Suspension
Current: F15 X5 XDrive 40d M Sport - Space Grey, lots of toys.
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