I also got the same msg while i did all the stuff you did
but then i gotta idea to work it out
i entered into system/library/extension/
then i deleted AppleAzaliaAudio.kext
then i gone to root path and then i gone to Library/reciept (remember the path and dont confuse with system/library its not the path i told)
then i erased pkg file for all the audio config i tried example sigmatel.pkg, AppleHDinput.pkg, etc (remember only audio config pkg file ok)
i also erased the Conexant.pkg file which they gave and i gone to utilty and had a repair permission and then i verified it.
Now i intalled the Conexant.pkg file which you guys gave and then restarted, now i didnt get the error file but i got worked only in speaker and not it headphone jack or SPDIF and mic too.
Iam happy with what you gave guys thank you thanks a lot after a day hard work i found the solution because of you guys and the forum
and iam waiting for a help to utilize my headphone jack and mic and spdif jack if i got it ill be very happy
Bye
