HP Pavilion dv6740er After bios update my notebook failed

HP Pavilion dv6740er

After bios update my notebook failed to start - black screen+blue lights.

the BIOS recovery:

download bios file from HP site

h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-57224-1&...

extract (unzip) 30CFF27B.wph file from sp38261.exe [1/1, 3.09M]

rename 30CFF27B.wph to bios.wph

insert USB flash to another computer

use WINCRIS.EXE to create a bootable USB disk.

copy bios.wph, MINIDOS.SYS, PHLASH16.EXE to usb disk

remove batery pack from HP Pavilion, unplag power

insert USB flash to @dead@ computer

hold Win+b, plug power, push power button

release Win+b after usb start blinking.

Wait 2 minutes till HP Pavilion shut itself down.

Thats all.

Good Luck.