2.2 Opening punch rivets by drilling out
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.
Drill out rivets with a 6 mm dia. carbide drill bit.
Punch rivets can be drilled out on both sides. When drilling from the protruding rear side, spot-drill the rivet shank only and remove the rest with a rivet punch.
Use a drift punch to remove punch rivet remnants in the aluminium (risk of corrosion).
Clean vehicle to remove chips (risk of corrosion).