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Why not just flash it with the latest sofware.
Use xperifirm and newflasher. There are plenty of tutorials on XDA developers on how to do it.
It's really easy. It won't void your warranty if you are worried about that.
I did mine over the weekend and I have absolutely no problems with Pie mentioned all over this forum.
Only thing I found that work for a limited amount of time is by removeing the SD card wait 30min then put it back in, I do find the phone reboots it self if storagae is around 90% full.