CWM-Backup from one S3 to an other ... no working W-LAN Connection topic

Dear friends, i have a strange problem: i took a cwm-backup (Original Samsung 4.3 Rom) from one I9300 and restored it after a full-wipe on an other I9300. Also Bootloader and Modem are the same. Everything works fine, only the Wifi-Connection failed. I can't access any Router with the message: "authorisation failed" ... and the WPA-Key is correct!

Can anyone help me? ... Please!

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