Hi, Does a greencard allow me to have dual nationality?

Green card does not accord you US Citizenship.

I-130 petition for a brother. What if we don't know the A number? Deported in 2005. Was he under immigration proceedings?

Consult with an immigration attorney where a prior deportation is involved.

Pending asylum case, no work permit due to my change of adress request. possible COS options.

You cannot change your status since you F-1 status expired. You would have to depart the US and try and obtain a new visa to be readmitted into...

Error cr1 or ir1?

You should be issued an IR-1 green card if the date of admission is more than two years after the date of marriage.

Is it possible for Canadian citizens (currently in the US) to apply for NAFTA TN visa at the US-Mexico port-of-entry?

This is entirely possible. You must be prepared to present all necessary documentation and information at the border.

How long does an immigration lawyer need to prepare and finalize an E2 visa package ready to file at a French Consulate abroad?

An experienced immigration attorney should be able to prepare a complete E-2 visa application for consular processing within two weeks, assuming...

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Can I report an immigrant who confessed he is still married to his wife in his country but also to an American here in US?

Yes, you can report your friend to the authorities if you want.

What is the minimum time to apply for visa on approved h1b petition

Your new employer must file an H-1B Petition on your behalf.

H1B Transfer without pay stub for 15 days.

You can expect an RFE under those facts. Hire an immigration attorney to deal with this.

Around how much can an appeal take to be responded to? is there an estimate?

You attorney should have filed his brief first if you are the appealing party. Get a second opinion.