Can I use AC 21 by moving from Company A to Company C while I-140 EB 3 to EB 2 porting pending with Company B?

You can.

Will there be any issue with my replacement EAD card ?

So long as the error is obvious and the mistake properly explained it should be okay.

How can I change my bond obliger ?

Both your friends would have to contact ICE, one would agree to take the place of he other.

My I - 29f petition for finance was sent back to luscious for reconsideration and deposition . what does this mean ?

More than likely it means USCIS is going to review and possibly rescind your approval because of the belief that your relationship to your fiancé...

What is form I-601?! And what are the reasons for it?

It is a form used to apply for a waiver of inadmissibility

Heb extension - REF - Responded - Pending , Decision status , Employer is terminating

There is probably not much you can do to force an employer to retain you on its payroll.

I am planning on marrying a woman who is illegally from Mexico she has been in the u.s for awhile but has no green card

Meet with an attorney. She may be eligible for a provisional waiver but she would have to return to Mexico. An attorney can discuss in detail...

You should meet with an attorney to discuss the specifics of your case, including how to handle the DUI case.

I am planning to withdraw my Asylum pending case

If you are a vild J1 there should be no effect

How Can My Illegal Fiancé and I Marry ?

Meet with an attorney. He may be eligible for the upcoming provisional waiver.