Windows 10: How to downgrade to windows phone 8 from a Microsoft 640xl running windows 10?

HI, before anything i'd like to clarify i'm not looking for solutions on how to stick to windows 10 mobile. I downloaded the Windows recovery tool but it doesn't find my model, i've tried restarting and unplugging my phone, i've searched through the other options (besides lumia) available on the right but Microsoft isn't on the list. Thanks

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Windows 10: A New Generation of Windows

You're mistaken. There is no Windows Phone 10. Microsoft is replacing the Windows Phone line with just Windows 10. Or, in other words, Microsoft is replacing Windows Phone 8.1 with the same Windows 10 that they are replacing Windows 8.1.1 with.

 

Unlocked Realtek HD Audio Drivers Windows 7 & 8 (With Dolby Digital Live and DTS Interactive)

DTS supported natively by Windows 8/8.1 and it should work on windows 10 too just DDL require to unlock your driver .

 

Microsoft Windows 7 Will Allow Downgrades too

Even though there's still some time left before the official release of Windows 7, Microsoft - the creator of this OS - confirmed today that just like some Windows Vista distributions could be downgraded to Windows XP with ease, the same will apply to Windows 7. General users of Windows 7 will be given the option of downgrading right over Vista to Windows XP, a Microsoft spokesperson has confirmed.
"This is not the first time that Microsoft has offered downgrade rights to a version other than its immediate predecessor," the spokesperson told Betanews, "and our Software Assurance customers can always downgrade to any previous version of Windows."
Microsoft hasn't detailed exactly how downgrade rights will work with Windows 7 - for now we know that Windows 7 will be downgradable to either Windows Vista or Windows XP - the rest of the details remain unclear.

Source: Betanews