|What was it you were trying to fix? The latest BIOS fixes audio stuttering.|
A BIOS flash should not be done simply because a newer version is available. And when done on a laptop, it should not be done under battery power, the AC power supply must be connected. As you may have found out, improperly updating the BIOS can turn a computer into a doorstop.
See if the following works: Lenovo ideaPad Y560 BIOS Recovery
EDIT: use the BIOS file in my 1st link to prepare the USB Recovery stick described above
message edited by riider