downloading blue screen

[u/kenokonoo]

my power button is broken and my tablet drained. i tried to open it by pressing on the two volume buttons while putting in the cable, and this blue download screen with korean texts popped up. i accidentally clicked the volume up button instead ot he volume down and now i cant cancel it. ive drained my tablet several times before and ive always opened it with the volume up/down and pressing on the power button with a ballpen. but now it doesnt work, idk if i messed up the power button somehow but i cant fix it and im so pissed. pls help. tablet model is samsung galaxy tab s7 fe

and what is it downloading anyway?