Canyon Speedmax CF SLX 9.0 2020 charging box tool to open

Hello guys,

I recently bought the Canyon Speedmax CF SLX 9.0 2020 and trying to figure out how to charge Di2. I know that I need to open charging box, but I have no idea which tool I need to open it. None of my L Shaped Hexagon keys fit (I tried 2mm and 1.5)

Do I need a special key to open it? I can’t even Google the answer.

Thanks for your replies I’m advance.

by Cautious_Concept_829