Easy answer - call an immigration attorney! You stated that you don't know what you're doing - the best advice is that you should consult with an experienced immigration attorney!!
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It will be hard to defend an "I didn't know" position.
The other attorney is correct, you need to consult with an attorney.
Many of us use Skype and there is a good chance that an indepth-consultation may be enough to get you on-track.
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FORMER IMMIGRATION LAW PROFESSOR -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.
You would file an I-290 if you were appealing the denial of your I-90. But the I-90 was properly denied, so what are you going to appeal? You need to consult with an immigration attorney very soon, and see if you can file an I-751 late. When filed late, you have to specifically ask the USCIS to accept it late and give a good reason why it was filed late. You are in a pretty difficult situation, but not hopeless, so please get help and don't try to do it yourself.
An I-751 can be filed late under certain circumstances. Consult with an
experienced immigration attorney who can review your case and advise you
how best to proceed. From what you describe, it sounds like you have
already wasted enough money and the filing of an I-290B will just add to
The other attorneys have provided excellent advice. If you would like to have an in-person consultation, I am located in DC. You may be placed in removal (deportation) proceedings. It would be wise to file a well-documented late I-75--the appeal will just be a waste of money.
This general information does not establish any attorney-client relationship. There may well be factors not mentioned in the question which could and should be addressed in an attorney consultation.