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Use the link that I posted above and then download a Sony Update Service to your PC, install it and run it. (Windows OS required).
After that, follow the simple steps.
Make sure that your battery is charged at least 60% and if you want to backup your important data, read this topic:
Let us know how it works.
Well then, I recommend you to perform a "Factory Data Reset"( similar effect as SUS).
Go to > Settings > Backup & reset > Factory data reset.
After that try again to update the software via "Update Center" using your phone.
Keep us updated.
Hi @hir
Have you check if the SIM of your device is on roaming ? Because when you are on roaming, you won´t be able to download your first Updates as another user posted.
Best Regards,