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you could downgraded using Xperifirm or Flashtool
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459
Hi @shrutigupta999,
Welcome to the community.
Remove your SD card and start your phone in safe mode. Do you still experience the same issue?
It could be coincedence. You can try reinstalling the update by doing a software repair. If this does not work I still recommend you test the SIM card.
There's no official way I can advise that will allow you to downgrade to a previous version.
Have you completed the software repair?