I have a PERM and i-140 approved by my previous employer. My priority date is 15 Mar 2015. I changed my employer in Jan-2020 with a similar job occupation. I was told that I don’t need to file a completely new process for PERM and i-140 with the new employer but the new employer can file an i-485J form when the priority date is current to complete the remaining GC process. Is this a valid process to complete my adjustment of status(i-485) and apply for EAD? What are the complications involved of going through the route with old i-140 and getting an approved i-485? If that option is not viable, will I have to file a new i-140 with the new employer? There’s got to be an easier way of dealing with this, because I’m sure many people have changed their employer after their i-140 approval.

Can you talk about this upgrade process from EB3 to EB2 for pending I-485? Does it need another I-485 application or just a letter to USCIS?

I was working with employer A for 7 years on H1 B and they have filed Labor and I-140 with Priority Date 2014. Now I am on H4 EAD since 2019 and working for employer B for same role .
My Priority date was in filing date chart and my ex employer A agreed and filed my I-485 with form J on November 2020. Do I have to join my old Employer A now or it's fine if I join them after I-485 is Approved? If I don't join them now , will there be any problems in the 485 interview if I intent to join after I-485 approval ? Is it possible that employer B can file form J form after 180 days of I-485 receipt date without joining my old employer A considering my Priority date will be on the final action date after 4, 5 years .

1) My I-140 approved one Aug 2020. Filed I-485 in Oct 2020. Pending application less than 180 days No GC EAD yet. In this situation if my job is terminated for some reason, what will happen to my I-485 application ?
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2) After getting GC EAD and AP and before final action dates becomes current can I go outside USA and work for same employer who filed my I-485 or any other employers using EAD or needs to stay and work in USA until my GC is approved.?