I-485 and AC 21


My I-485 has been pending for more than 4 years and was filed under EB2 (MS + 0). I have been working for my employer who has filed the I-485 for 13 years.

1) If I use AC21 and move to another job with similar duties but whose requirements are Bachelor's Degree (BS) + one to three years of experience, would my I-485 be reclassified as EB3?

2) If the answer to 1) is yes, is the only way to remain at EB2 when changing jobs and using AC 21 is to ensure that the new job (with similar duties) is BS + 5 or MS + 0 (or more years of experience)?

Thank you!