Network upgrade issue

  • Hi,

    I am using 750 network sites (Approx 66000 database tables) using WP version 4.2.6. Now I want to upgrade WP to latest version but when I try to upgrade the backend goes blank. Frontend is working fine but WP dashboard shows WSOD. Can anyone help me for the entire network upgrade. I have followed the default WP update steps. Also tried increasing memory limit, execution time, post max size etc.

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