i have installed the sounds update with the Pen Drive and at the hardware test i have an error at KetA04 ERR, i mentrion that before the pen drive i did nat have this error. what can i do ? install it again or try with other stick ?

The main question should be, how you Audya sound after the upgrade? If it was me and the keyboard sound as expected, then I don't care about the error.
Now if the error is causing some issues, then I will reinstall.
Ketron have never explain to the users what those errors means.

before i did not have this error, Audya was acting normaly. I tryed to reinstall the stick and is not working anymore, i did eaven a copy from another unused stick but it can not be installed, but why ?