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Code 49 - No response in Logic Pro X

I just buy a new iMac with logic pro X. I have EL Capitan version 10.11.4
At first i was able to make some noise with the pads and keys but now i have no sound. I'd follow all the step on this topic and it didnt work. I had try to download the driver and when i clip on the code49 firmware updater it tell me that i have no code49 plug in . What the hell is happening ?
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