Firmware update failed - need to make a backup via PC

Hello all,

today my note air 3c asked me to make a firmware update.
Stupid me, I did not activate the cloud backup, but ticked ok to do the update.

After I tick yes or ok, the screen got lost and made some stripes, but no information about the update.
I waited 3 hours and tried to restart the device, but without success, the screen is only stripes, in beween it gets dark and lighted, and a part of a pic is visible, then again the ONYX Logo, so no chance to start.
So I connected it to the PC, tried to push the home button again, and got shades of the PIN-keyboard and tried to hit the numbers while connected to the PC.
Now I have access to the Note via Win-PC, can I anyhow find and safe my notebooks saved on the device to access to them?

Thank you for your support.
Ulrike