I-140 portability -- follow up with any_mor_left answer

any_mor_left and all Teachers:

Thank you for your reply.

When I change employer, a transfer of H-1b has to be filed, and USCIS will know immediately I change employer.

My lawyer said a AC21 has to be filed after I change employer, no matter what my situation of I-140 is. Since in my case, I-140 is still pending, then only when I-140 is approvable, I-485 can be ported.

When should AC21 be invoked? Any experiences in this forum?

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