[Moto G4 Plus Guides, News, & Discussion] echo92:
Some observations about this patch:

a)36.2 MB in size, carrying the December 2017 security patch as noted above with a final build of NPJS25.93-14-13/3. md5: 28d24a02c7e7caecf4be102a6059074f Though it's the 1st December 2017 update, I'm not sure if this update has the KRACK patches built in (as they were covered by the 6th November 2017 patch) - depends on when Motorola got the patch. Apologies for misleading anyone.

b)From the updater script, requires NPJS25.93-14-10 already on your device to flash.

Package expects build thumbprint of 7.0/NPJS25.93-14-13/3:user/release-keys or 7.0/NPJS25.93-14-10/10:user/release-keys

c)Looks to be carrying updates for some apps/services, such as BellTVWidget and OmegaPttMX.

d)As helpfully noted by RenePaul99, updates the bootloader to B1:07 (with a build date of 2017-11-07) from B1:06 in NPJS25.93-14-10. This may result in the blankflash we have at https://xdaforums.com/moto-g4-plus/how-to/moto-g4-plus-hardbrick-solved-guide-t3657761 failing to work if this OTA update is applied - it may check and only work on B1:06 and earlier bootloaders (and no, generally you can't downgrade bootloaders) I'm not certain of this, though I dislike seeing devices bricked and the only resolution being an expensive motherboard replacement. So crucially, if you've updated your device to this OTA update, be very careful if you decide to flash older Motorola stock ROMs (e.g. after flashing a custom ROM), as an OTA update could hard brick your device, and the current blankflash may not work in rescuing your device. The safest way to revert, if you updated to this stock patch level, would be to use your TWRP backup or wait for the NPJS25.93-14-13 fastboot ROM to be 'obtained' (leaked) from Motorola.

EDIT - 17/01/2018 - I've seen one possible rescue with the latest blankflash we have from a user updated to the December 2017 B1:07 bootloader. Though it suggests the blankflash is still working, be very careful regardless.

As generally with OTA updates, they only will flash successfully onto a device with a clean stock system, stock recovery and stock kernel. Unlocked bootloader status doesn't appear to matter.

Of course, if you're rooted, then the above aren't true; I was running a XT1642 with TWRP, ElementalX and magisk 13.3, so the OTA update is a no-go. One straightforward way to restore my device to a OTA friendly state was to re-flash the NPJS25.93-14-10 stock ROM (which we have here: https://xdaforums.com/moto-g4-plus/how-to/stock-rom-npjs25-93-14-4-march-1-t3608138)

The following flashing commands I used should not affect your data and return your device to an OTA friendly state, but as always back up your data just in case. You may be able to use fewer commands but I prefer to flash all these partitions (you probably want to do things properly with the core firmware running your device!) As far as I know, system, OEM, boot, recovery and logo partitions need to be stock at the very least. GPT/bootloader/modem you could omit if you're sure they are the same patch level as NPJS25.93-14-10 (bootloader should be B1:06 and modem should be ending in 62.01R), if you're not sure, I'd flash them too to ensure all your firmware is of the same patch level. Don't mix and match patch levels when it comes to OTA updates... Oh, and check that you have plenty of time, you don't want to rush firmware flashes.

fastboot flash partition gpt.bin
fastboot flash bootloader bootloader.img
fastboot flash logo logo.bin
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash dsp adspso.bin
fastboot flash oem oem.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash system system.img_sparsechunk.6
fastboot flash system system.img_sparsechunk.7
fastboot flash modem NON-HLOS.bin
fastboot erase modemst1
fastboot erase modemst2
fastboot flash fsg fsg.mbn
fastboot erase cache
fastboot reboot

After manually flashing each command (copy and paste is your friend, though nothing to stop you using a script), my device rebooted to system (complaining of bad key or N/A on the bootloader warning screen, that's normal). Rebooted to stock recovery (with the Android on its back and the no command), then held the power button before pressing and releasing the volume up key, then releasing the power button. Took a few tries before getting into the recovery menu. (as explained here: https://xdaforums.com/moto-g4-plus/help/command-stock-recovery-xt1642-t3484616 )

As before, flashed the OTA update without issue from the SD card/internal storage (though had to mount /system as the recovery complained it couldn't mount internal or external storage, after mounting the 'apply update from SD card' worked and loaded up internal storage...), wiped cache after installation and rebooted.

Now I'm running NPJS25.93-14-13 and still have all my data :) Not rooted or having TWRP on, but I might see how I get on with this new build. Initial impressions are that it's fast and stable, though early days yet. As for the camera, photos and video with the rear camera appear to work okay with version 6.0.86.7 of the Moto camera app, what problems have been mentioned with the camera?