Bios Mods -The Best BIOS Update and Modification Source

Hello Bro's I Have Lenovo B490 (20205)
Yesterday I update my Bios With Windows 7
after Bios Update My Laptop Turn On But BlanK Screen
I Try Cmos Reset --- Not Working
I try Bios Flash With Usb ----- not working


Any Other solution Help Me Bro's

Plsss
pllllssss
plssss

any one help me