The student exchanged the battery of the DSLR.
text: I think you can press it and try to unlock it out.
text: Mmm.
text: Slower.
text: Oh, try to open it with the SD card.
text: SD card?
text: Uhh, mhm.
text: Maybe you can try to use the SD card.
text: This?
text: Open it up.
text: Ahh, yes!
text: Yes.
text: Now please change the battery.
text: And now you just insert the battery.
text: Ahh.
text: Ok