Immigration Voice

I am evaluating the pros and cons to use AC21.

I am under AOS immigration status. I filed I485 in July 2007, my I-140 was approved in January 2008 and I got last renewal of EAD at the end of last year (that expires on Oct 2010), all while I was working for my same old employer.

I just changed employer but did not advise about it to USCIS yet. I could see in different threats that it is recommendable to inform this kind of changes to USCIS but not mandatory.
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mv_v25