G580 BIOS Upgrade and Downgrade(Windows 8.1-Windows 7)

I got a issue with my G580(20157) I have UPGRADED from Windows 7 Home Basic Preloaded to Windows 8.1 Pro by using DVD after OS Installation i have Updated my BIOS[62cn97ww_64] from [62cn40ww_64](My Bad) I'm able to Boot into Machine by Changing Boot Settings In BIOS(UEFI to Legacy and all that) it works fine.I Installed Energy Manager(Windows 8.1) the Function Keys Works Fine.Then After 3 Months I just rolled back to Windows 7(OEM)by Using OKR(One Key Recovery) Using NOVO Button Now I'm not able to use My Some function keys which works well with Windows 7(Fn+Esc,Fn+F4,Fn+F5) While (Fn+F1,Fn+F2,Fn+F3,Fn+F9,Fn+F10,Fn+F11,Fn+12) are working.
So My Question Is
1.Can I Downgrade My BIOS(62cn97ww_64) to (62cn40ww_64).
2.I cant See My Fan Dust Removl In Windows 7 Energy Management(7.0) But in Energy Management 8.0 Version I Can See and use It and the brightness bar(when i increase and decrease brightness) and the wifi Interfarence of turning ON and OFF is not coming.
3.My system is heatng up a bit while using some fullscreen apps
4.i want to know that how can i rollback my BIOS to 62cn40ww_64
should I contact Phoenix TechnologiesSupport to Downgrade My BIOS?
Or should i wait For Windows 10 because I I m thinking to upgrade when Windows 10 come(Because there is a rumour that Lenovo will provide a free Upgrade to legit users.
I Request all Techies and Engineers to please answer my Questions ASAP.

It can be made into a nice system, powerful and stable.  But to do so takes an unprecedented amount of effort.  To make Win 8.1 as powerful as a well-tuned Win 7 is doable, with a fair bit of configuration and 3rd party software.
I didn't care for Windows 8 at first either, but right now, after all the latest updates and quite a lot of tuning I feel it's the most powerful and most stable system I've run at my company.  I just finished a 14 hour work day developing
software, collaborating online, running heavy applications like Photoshop (we do graphics software development), doing research, and my system just sailed through it all with not even the slightest hiccup.
Windows 8.1 is finally mature and can (just barely) be coerced into being a damned nice desktop system.
-Noel
Detailed how-to in my eBooks:  
Configure The Windows 7 "To Work" Options
Configure The Windows 8 "To Work" Options

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