If you already have the original MAIN and FS files for your phone, there's no need to backup the drivers from the phone. You will find the acoustic, camera and display drivers by extracting the raw content of FS (file system) with GExtract 1.3 and SEFSTool4.
The paths to drivers are the following:
_FS.raw\IFS\SETTINGS\ACOUSTIC
_FS.raw\IFS\SETTINGS\CAMERA
_FS.raw\IFS\SETTINGS\DISPLAY
Be well!
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