What U.S. visa can I get as an owner of equity in a U.S. company ?

You may have several options available to you. Seek the help of an immigration attorney to go over all the facts in your case.

Can I request a faster service with the USCIS?

Go back to the DMV and ask to speak to a supervisor because the I-551 stamp is proof of lawful permanent residency. Good luck!

Since you have a final order of removal, USCIS does not have the authority to adjudicate your adjustment of status (I-485). You need to obtain an...

Had interview for AOS, IO mention can't approve the case as of now because 1-30 document was not with him

Unfortunately you are going to have to remain patient for the time being. If you have advance parole you can leave and return. Make sure to work...

Need someone to review from N-400--I already filled it out

Your best bet is to consult with an immigration attorney who can go over the application with you to make sure that everything is properly filled...

Are there any kind of restrictions for aliens with down syndrome as far as the immigration is concerned?

Your question requires more analysis. Please contact an immigration attorney to assess your brother's individual case.

Am i eligible for voluntary departure? If yes how long will I have a bar returning to united states?

Voluntary departure is a minimal form of relief that you should accept only if you will truly depart within the time period allotted. Otherwise, it...

How do we correct this issue before we file?

Not an issue. You can explain it to the officer at the interview.

Citizenship ,N400 AND NATURALIZATION

Based on what you have written you shoukd be fine.

N600 part 2 question 23. Need some clarification

Since you no longer reside with him anymore, the correct answer is "no".