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my new phone always wants to do the software update, i did it 7 times successfully but there is already the softwareupdate message
Could you check with XC
Alternatives on How to backup Xperias
Not sure if this is still an issue for you, but you might find this helpful: /t5/Xperia-XZ1-Compact/Software-update-death-loop/td-p/1325934/jump-to/first-unread-message