Why is my Samsumg Tab S 10.5 frozen?

A

AC Question

Samsumg Tab S 10.5 frozen

During chanrging the TAB the screen went black. It did not react on the power button nor rebout with Power and volume up.
Only thing i get sometines in the left uper corner of the display are the options
SDCRAD Mode
up key: normal booting
down key: dowlnoad

But i can not select any of this options.
Any itea how to fix this ?