Satellite U940 - after the update of Win8.1 FN key stop working

I have ultrabook Toshiba U940-b484, after I updated my system windows 8.1 all FN keys does not work and after more try only up/down switch soung and brightness keys is just the word, and keyboard light switch is not working too, all solutions?

Concerning

I by Satellite U940-103 and I did Win8.1 with success. Everything works perfectly.
My only solution is: Win8.1 update must be performed according to the instructions of update Toshiba Win8.1 instructions for installation and http://www.toshiba.eu/innovation/generic/windows8_1-upgrade-stepbystep/ document which can be downloaded on Toshiba support and download page.

Have you installed all the specific tools available Toshiba and utilities?

Tags: Toshiba

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