System restore is locked by password

Installed a new harddrive (SSD) and tried to restore the OS via the system restore function (CMD + R)
All i get is a grey screen and a prompt for password.
I know that I did set a password in system restore mode, but that password doesen´t work.
Its a long password that contains special characters, for example "@".
When typing @ or other special characters in the password field there is no response. When typing alphabetic caracters there is response; one "bullet" for each character. Thinking that maybe using special characters in the password might be the problem...
Please advise...

If you still have access to the previus installation of Mountain Lion then you can remove the firmware password by executing the following commands in the terminal:
sudo nvram -d security-password
sudo nvram security-mode=none
I'm not sure if the second line is completely necessary, but I just did this to remove the firmware password from a friend's laptop, because we had the exact same problem you describe, I don't know why but there seems to be a bug in Mountain Lion that lets you include special characters in the password even though it's impossible to put them in the password prompt.

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