Above is the leaked soak group update from today. You can apply this over top of an 890 fastboot install. This will have you as official as you need to be for any future updates. It's not clear if you have to do anything after doing the 890 fastboot, but if you want you can install that update in the link.
FYI the filename of the update is the previous system number(959) because that is the system Moto expects for it to be applied to,,,just ignore it.
Edit: the main reason to apply the 890 update over the 890 fastboot is if you didn't go for the full fastboot and only applied some of it. This could result in having 890 system but still have the 959 baseband.
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