1. If I have my I-140 Approved and its been more than 180 Days after approval then I believe that even if I change the employer the I-140 does not gets revoked and it still stays valid. I can continue to extend my H1B with my old I-140. Is my understanding correct?
2. If suppose I have applied for my H4 dependents EAD while I am in my first company and both of us are working. Now it's been 180 days after my I-140 got approved and I switch my employer. In this case does my dependents EAD get's affected in any way?
3. Now assuming that answer to first question is Yes, but I believe that in-order to apply for GC my new employer has to file my PERM and I-140 again. If that happens will my dependents EAD gets affected in any way until the new I-140 gets approved?
1. The essence of your understanding is correct. You are safe against revocation.