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first you need to contact the INS office who approved your 600A explaning to them your fingerprint is expiring soon. You can't just go to the finger printing site and pay for it as they require for you to have a letter from INS. they can send you the re-fingerprinting order, and you take it to your nearby finger printing station. I don't remember how much it cost, but you have to send INS re-fingerprinting fee upfront.
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