Lenovo BIOS Downgrade

Hello. I need help.

My laptop is a Lenovo G580 (20157) with BIOS ver. 62CN97WW. I upgraded it from the original version: 62CNC41WW.

Now i want to downgrade to the old version or maybe to 62CN40WW which i see is compatible too. (on Lenovo website)

Before the upgrade i made a backup of the old BIOS which created a .ROM file. (using Universal Bios Backup)

Please give me instructions/tutorial on how to get that old BIOS back using the right tools.

The purpose of this is to get rid of that Whitelist check with the right mod and right BIOS version. You all know what i'm saying. Otherwise you won't read these lines.

Thank you very much in advance.

Best regards,
Daniel

 

Thank you LatinMcG for reply but this is not what i asked for. I've already read those pages before this post, trust me.

Otherwise, thank you for help. Maybe someone else can give me the right answers.

Regards,
Daniel