Maybe this will help: Upgrade/Update Sony Ericsson Vivaz Pro to 7.0 Nougat http://upgrade-nougat.tech/2016/11/sony-ericsson-vivaz-pro-3075.html
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Maybe this will help: Upgrade/Update Sony Ericsson Vivaz Pro to 7.0 Nougat http://upgrade-nougat.tech/2016/11/sony-ericsson-vivaz-pro-3075.html or How To Upgrade/Update Sony Ericsson Vivaz To Android 7.0 Nougat http://rom-nougat.org/download-rom-sony-ericsson-vivaz