I140 Amendment denied, can I do AC21?

I140Amendment

New Member
My I-140 got approved on June 2007, since my company A merged with another company B and changed its name and Federal Id to B, my current employer B filed an Amendment for my I-140 on July 2007, USCIS denied the amendment saying no LCA was attached while my company's attorney says they did attach the LC documents. Now they filed Motion to Reopen attaching LCA documents on June 2, 2008, given all these I planned to switch to different employer using AC21.

Additional information:

I485 filed on July 2007
Got EAD approved on Sep 2007
Got AP approved
Done fingerprints

1. Would the amendment denial negates my original approved I140?

2. If it is so would it revoke my pending I485 EAD and H-1(as I am already in 7th year extension)?. Note: I did not receive any notification from USCIS regarding revoking I-485, H-1B etc. My current employer says it wont be so because I already have approved I140

3. Would it be adviced to switch to new employer(Law firm from new employer says there wont be any problem since I already have approved I140)

4. Would there be any problem when USCIS starts processing my I485.(My new attorney says my I485 will be based on new employer and my skill set is matching the position they offered)

Please advice
 
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