Try changing your gamepassword ?? Maybe you entered it wrong.

or maybe u finished all the unlock left in LFS

たぶん来週の金曜日まで待つ

Maybe your LFS folder is set to read-only. You could check that.

Don't know if it would unlock in the first place then, though.

Once you have unlocked your LFS it´s allways a good idea to backup your \data\misc...