8老师你好。今天收到绿卡。可是绿卡上的category 是错的。我是从EB2降级到EB3，在EB3绿的，可是绿卡上code 是E26，而我的priority date 在EB2目前并不current. 娃的code是对的，E30(children of EB3). 我两个月后要回国一周。请问：
1。需要主动联系USCIS更正吗？
-You need to file I-90 to get the replacement. Send the green card back with the I-90 filing and write a letter to explain what was wrong on the green card. No fee.
2. 不想file I-90，太麻烦了，可以做service request 来更正吗？
-No.
如果能，大概要多久？
3. 在绿卡更正期间，这个错的绿卡还能用吗？因为要回国一周，有些担心-After you file I-90, you can bring the I-90 filoing receipt to the local USCIS Office to get the green card stamp on your passport, then you can use the stamp to travel. You can use this card to travel, then file I-90 after you return to US. The card is valid now, but if you do not get the replacement with the correct category code, you may have potential trouble in the future when you renew your green card 10 years later or apply for the US citizenhsip.
4. 现在已经收到绿卡了，那combo card 和h1b 是否还能继续使用，-No. You can show this card to your HR to update your file there before you return the card to USCIS. You also can use the green card stamp to work and travel (see above).
如果绿卡在更正期间？
谢谢8老师。
