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Casio FX82ES Scientific Calculator - Page 6 Questions & Answers
Forgot password for casio sf-4000
From the original manual of the SF 4000
"If you forget your password, there is no way to recover it or to access the Secret data. You can only Reset to clear the entire memory and start again.
To change an existing password, enter Secret mode and then press Clear and then the Secret key. The password XXXXX appear. Press Function then select 1 - Edit to edit the password, then press the Secretkey again when finished editing to save the change.
The data item editing menu has an option to move individual items in or out of Secret mode"
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