1. First and foremost 180 days is important. Yes you can change jobs only after 180 days from RD of I485 (whether I140 approved or not)
2. If I140 is revoked after 180 days by the original employer and alien can prove that the new job is in the similar classification, I485 will not be denied and i140 (and LC) will be held valid .
3. Alien has to inform BCIS about change of job. If BCIS comes to know of a change of job or I140 is revoked by original employer there wont be a RFE, there will be a notice to deny, at which time getting all the required documentation might be difficult or not enough time.
4. Alien can work for somebody else in the meantime pending GC approval. So for the NTD a letter from the sponsoring employer might be enough to save the GC. But beware, after GC approval you will be expected to work for the sponsoring company for at least 6months to 1 year.
2. If I140 is revoked after 180 days by the original employer and alien can prove that the new job is in the similar classification, I485 will not be denied and i140 (and LC) will be held valid .
3. Alien has to inform BCIS about change of job. If BCIS comes to know of a change of job or I140 is revoked by original employer there wont be a RFE, there will be a notice to deny, at which time getting all the required documentation might be difficult or not enough time.
4. Alien can work for somebody else in the meantime pending GC approval. So for the NTD a letter from the sponsoring employer might be enough to save the GC. But beware, after GC approval you will be expected to work for the sponsoring company for at least 6months to 1 year.