asking for help and thanks!

Many thanks in advance! I have filded EB1I140 and NIW last year on April. My both I140 have been approved.My I485 was attached to my EB1b. My question: If I change my job( the samilar job), is there influence to my I485 if my boss withdraw the supporting letter? Or can I change my I485 to my NIW before changing job?

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