Re: stuck at verifying system update and repair is failed with companion
You could first:
--manually copy all of your documents to a computer using a USB cable,
--mke sure that Google has recently backed up all of your data, and then:
If you have any previous recent full backups through Xperia Comapanion, you could attempt to restore one of those to your phone (using Xperia Companion).
You could attempt to do the full restore of your phone's firmware using Xperia Companion, which will automtically obtain the most recent from Sony. But your phone would be restored to factory settings, and then you'd allow Google to set up your phone with apps, and you'd restore your documents manually copied, above.