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As far as downgrade, you have 2 options
1. contact your local Xperia Care
http://support.sonymobile.com/global-en/contactUs/
or
2. use flashtool
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459
The problem might be that when WiFi or Data its on the phone is either auto updating apps or autobackup data.
Check under google photos if it's auto syncing, also check if you have other apps/services that auto syncing.
It'll be wise to reinstall lollipop with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
As far as downgrade, you have 2 options
1. contact your local Xperia Care
http://support.sonymobile.com/global-en/contactUs/
or
2. use flashtool
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459