Sovol SV06 - When I turn it own, the display just shows an empty screen - SOLVED!

When I turn it own, the display just shows an empty screen. The fans are starting the screen is backlighted but just doesn’t show anything. I don’t have it connected with usb.
Yesterday it worked, today it doesn’t. What could be the issue?
Thanks in advance!

What I already tried is to remove the screen and put it on a table and also to flash the firmware using the sd card. Didn’t help.
Problem solved. I had to rename the firmware file to “firmware.bin” now it worked and the printer is alive again.