Remove these two security torx screws and remove the plastic beauty cover.
Remove these two screws holding the huge metal bracket on to "hold" the tiny little cable for the rear light.
Behind that little panel you'll find a keyhole. This is the secret key slot for manually unlocking the battery door, viewed from the inside.
Make yourself something like this from 3mm thick metal, the 50 mm bits can be longer if you want.
There we have it! Now if anybody can help me flash the 1004 Wh that would be great - I'm into it via serial over IOT but struggling..!