Default Can any one help me plzz

I want to instal new stock rom but iwant to backup all things in my phone like the stock update and acconts and the apps whit data
But the important is the update for the stock rom I mean when I instal new stock I will get the ota update but I don't want to update it can I backup the update from my rom and instal it in the new rom plzzzzzz answer me

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