In the future, play it safe and don't use WinFlash. I know that it works sometimes, but it's well-known to have a higher failure rate than Easy Flash. I just don't think it's worth taking the risk.
Just curious, what do you mean by "you need to put the battery of the notebook and restart it?"
i think you use winflash to update BIOS right, i thin you can download old version BIOS and save to usb derivce that is can be booting, press ctrl + home to flahs back old bios, if ok, please update bios by ezflash at bios. if not, i think you will sent to service center.