This problem can be solved by this way :
1. You need a Nokia 9210.
2. You need an unlocked MMC (can be borrowed from your friend)
3. Put the unlocked MMC into the memory slot of Nokia 9210i.
4. Choose the command that will format the MMC (unlocked MMC)
5. When the fone ask you to confirm the format order, quickly remove the unlock MMC and put in the locked MMC which you want to unlock.
6. Press Ok.

If you're lucky, the locked MMC will be formatted and the password will be also break. Good luck !