Transferring data to JP e-amuse card

I recently bought a sound voltex controller, and would like to be able to play a few rounds of Gravity Wars (PC) sometimes. However, I currently have all of my e-amuse data for DDR and SDVX AC on an American e-amuse account and have a blank Japanese account set up and ready to go. Can anyone explain how I can safely transfer my data from my American account to the Japanese one and still use the same card?

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If you already have a Japanese account set up, it should be fairly quick and simple.

Step 1: Log in to your American e-amusement account.
Step 2: Go to the e-AMUSEMENT PASS main menu (link provided).
Step 3: Near the bottom right-hand corner of the page, you'll find a small hyperlink that reads "Disconnect an 'e-AMUSEMENT PASS' from KONAMI ID". You can also click this.
Step 4: Pick your current card, and deactivate it.
Step 5: Log out, and log in your Japanese account.
Step 6: Register your e-AMUSEMENT PASS.

It should be good to go from there.

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Will I still have access to my data for DDR? I value that more than having the japanese account.

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shouldn't you be doing a data transfer instead

allow me to recall how to do that

Of course. I lent my entire card to a friend with a JP account so he could set up Fast/Slow for me, and then give it back. Your play data resides specifically in your pass, not in an e-amusement account.

IIRC, a data transfer would be getting data from one pass that you either lost or have damaged transferred to a new card. You'd need to register the new card on your American account to transfer data from another card registered in the same account.

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The data's not stored in the card itself. There's a 16-digit code (not the one on the back) on the card's chip that's sent to the cab and then the cab retrieves the associated data through eAMUSE. You should do a data transfer to a fresh japanese account, disassociate the card from your US account, and then associate it with your new japanese one.