When I updated to IOS 6.0.1 my WI Fi key is not more available, so i can not conect

When I updated my Iphone 42 with IOS 6.0.1 my WI-FI Key is not more available, so I can not conect to internet

- If the screen remains white, let the battery fully. After charging for an hour, try a reset:
Reset iPod touch:  Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
And restore as necessary,
- If it is off try:
iOS: Not responding or does not turn on

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