140 approve and I-485 changing jobs after 180 days

Should I Use AC 21 - Ginnu or any good friend..

I applied for concurrent 140/485 in Dec 2004, laid off in Jan 2005, Got EAD and 140 was approved 6 months later. Working for a reputed company in a similar position.

Should I apply for AC21, I talked with my lawyer, he said, he was not sure, it is better to wait and see.

Will it be a problem if I use AC21 as I was not employed with the same compnay when my 140 got approved.
 
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