I am currently on H1-B visa (valid until Dec 2021) and my Priority date is May 15, 2010, in EB2. I am working for employer A and I have recently applied for I-485/AOS in Oct 2020. Both EAD/AP are not approved yet and haven't received biometrics notice yet from USCIS. Kindly see below questions and advise.<br>

1) If I change to employer B after 180 days of filing I-485, how would USCIS know that I changed my employer if I do not file new I-485 J that's given by employer B?
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2 After getting EAD, can I stay without working for a few months? Is there a regulation that says that employment based I-485 applicant needs to work continuously after obtaining EAD?
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3) I am working for a consultancy company and recently changed my client who is not within 50-mile radius of the existing MSA. My current employer A is not planning to file H1-B amendment. In this case, if there is a site visit by USCIS officer and if they revoke H1-B, then am I still considered to be in legal status because I already applied for I-485 in Oct 2020? Am I safe to stay legally in USA in this scenario even though I did not receive EAD based on AOS?
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4) If H1B amendment/extension of an employee gets denied after filing AOS/I-485, is the employee still considered as in-status because of pending I-485?

I have filed for I-485,EAD,AP along with EB2 to EB3 I-140 downgrade in October 2020. Got the receipt notices.
1)After 6 months of I-140 approval & I-485 pending with USCIS. Once if I switch job to new employer and use my EAD,AP. Should I have to ever come back to my employer (who sponsored my green card)before I receive green card or after I receive green card for any duration of time anytime?
2)What happens if I stay unemployed after using EAD for some days before I receive the green card? Is my I-485 automatically denied?
3)Is it possible for me to go back to EB2 line with same employer if I start using EAD and AP based on EB3 downgrade I receive?
4)Is it possible to start a company on my own using my EAD and work for my own company till I receive green card? If yes, then say I am working project to project basis consulting do I need to file any other documentation?
5)Why do people maintain H1B status even after getting EAD. Only risk I understand is I-485 denial. But if everything is clean and clear with respect to I-485 why do candidate needs to keep maintaining H1-B visa.
6)What are the risks for EAD and AP renewal. Does the candidate need to prove anything related to job/salary etc any time for renewing EAD and AP each time till I get green card.

Currently, I am On My H1B, filled H1 extension on time, before I -94 expiry, ( Perm, I-140 Approved ). When H1 extension pending in normal process can I apply for a change of status to F1 by using the H1 receipt number? While I am on F1 if my Priority date is current, can I Adjust my status / file (i-485) when I am on an F1 visa? Will it be an issue If I am F1 visa to Adjust my status if priority date is current?