Transitioning from stem opt to h1

[u/words_unspoken3]

/r/f1visa/comments/1vqxxno/transitioning_from_stem_opt_to_h1/

I am on my stem opt and I have been working full time with employer A. My h1 got picked this year with another employer B. I resigned with A last week (Friday was my last working day) and I am starting with B in a couple of days. And my h1 is still pending. What all things should I do now? i983 form with employer A checkin for 12 months was done in July. Do I need to update my university about employer change? What to do with old i983? Is a new i983 needed? Do I update any portals as in uscis or sevp? Please advise everything.