Android updater
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Yes, install flashtool and download a firmware that is still on Oreo (check version number). I used the SG one (4G icon and NFC persistent icon). After flashing it, you most likely end up in a bootloop. Fix this with Experia Companion. Don't wait to long though; once Pie is available for all regions, you can't use Companion to fix the bootloop AND stay on Oreo. You will be stuck with Pie. Good luck!
That firmware is available in xperifirm on Central Europe 1, you can download in that app easily by installing flashtoolHey which version of SG firmware do you have? I'm looking for XZ2c 51.1.A.11.51 - if you have it do you mind uploading it somewhere and sending a link? Thanks!