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Have not installed microsoft UAA bus driver, without this conexant can’t be installed.
This is not available on Lenovo official site, however you can download this
from hp site.
url is ftp://ftp.hp.com/pub/softpaq/sp33501-34000/sp33867.exe
This works on many notebooks including Lenovo G450.
First, install this driver, if any error is shown then ignore it, then install
conexant audio driver and [...]