This tool for ECU BMW EDC17CP41/45 can drill a hole in the ECU cover to access the BL zone without opening the ECU. Due to the hardware of these ECUs, it is very hard to open them without damaging the components. For this reason this product is very useful. Using it with a vertical drill, it is possible to stop drilling right before risking any damage to the mother board.

Check this video for more informations: https://youtu.be/_8EzkOlLtFQ