Fritz! Box 4020 Configuration And Operation page 156

User Interface: System Menu
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If you lose your FRITZ!Box password and did not configure the "Forgot
password" push service, you will have to restore the factory settings to
the FRITZ!Box and you will have to reconfigure all of your personal
settings for your internet connection and your home network.
Characters Allowed for Passwords and User Names
Characters
Letters of the Latin
alphabet (a-z) in lower
case and upper case
Numerals (0-9)
Spaces
Umlauts (ä, ö, ü)
The letter ß
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FRITZ!Box 4020
Select a password with at least twelve characters, which includes
capitals and lower-case letters as well as numerals and special
characters; see Characters Allowed for Passwords and User
Names, page 156.
Configure the "Forgot password" push service. When you have
forgotten a password, the FRITZ!Box sends an access link to the
email address you specified. Using this link you can set a new
password.
Allowed for
user names,
passwords
user names,
passwords
user names,
passwords
156
Not Allowed for
user names,
passwords
user names,
passwords