Nokia 9210i User Manual page 218

To remove password protection, press the Menu key and select Memory card >
Security > Remove password.... Type your password and press Remove.
Note: Use a password that is easy for you to remember but difficult for others
to guess. If you forget your password, the only way to use your memory
card again is to format the card. Formatting deletes all data from the
card! To format a memory card press the Menu key, select Memory card
> Format memory card..., and press Format.
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