Update to the current Apple TV (1st generation) software. For steps, see: "How to update Apple TV (1st generation) software".
Apple TV (1st generation) cannot join networks that use high ASCII or double-byte characters in the password
Apple TV (1st generation) cannot connect to a wireless network that contains high (extended) ASCII or double-byte (Unicode) characters (such as Japanese, Korean, or Chinese) in its password.
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