I have the same problem. Brand new Xperia X Compact. Out of the box - the phone's system update offered download and installation of Android Nougat 7.0 (34.2.A.0.266). OK...Download...Continue...Power down...Verifying system update...Reboot...finally "Software update - Could not install new software version. Please try again." So I tried again, and again, and again... still no success. After reading the support forums, it seemed I should update via PC, so I installed Xperia companion and selected Software Update. The phone appears to start the update, installation and reboot. Finally I get the error: "An error occurred while updating your device. Error code: kResultCode_DeltaUpdateResultDidReturnFail" Is there anything else that I can try first before running Software Repair? Let's face it, I've already spent time installing aps, backing up and moving all my data to the new phone. I don't want to run Software Repair unless I have to, and unless I am sure that this is ABSOLUTELY going to work. Come on SONY, what's going on here. I buy Xperia phones cos they're supposed to work like a dream, how can so many people have the same problem?!
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