-
After 15+ years, we've made a big change: Android Forums is now Early Bird Club. Learn more here.
Yes, I don't believe that you'll be able to install the OTA if the filesystem is modified (to include the addition of superuser).
The cleaner option may be to instead flash the latest factory image, then re-root. We've got a nice guide on flashing over >here<, but let us know if you've got any questions or need any help.
julio99
Newbie
Thanx for the reply. I used the Wugs Toolkit to root my phone. Right now I'm at 5.1.1 and running build number LMY 47V. I know how to unroot with the toolkit but once I do that I will need the new update to install and I'm not sure where to get it once I flash the stock image and unroot. I am used to the Wugs toolkit but I will need to download the new update once I'm unrooted so if someone can help me with that I'd be greatly appreciative.
lion7718
Android Enthusiast
Wugs can do all that for you...
Open Wugs & under "flash stock + unroot" choose "device is on/normal then click on "flash stock + unroot". From the dropdown menu choose the new build "LMY48I" under choice "Automatically download..." under settings check "No Wipe" & "Force Flash" than hit ok.
This will flash the new image & keep all your files. When it is done, use Wugs to root & install custom recovery again.
I've tried to install just the update through Wugs, but I've too many changes & it always fails.
Flashing the factory image is just as easy, just takes a little longer.
Open Wugs & under "flash stock + unroot" choose "device is on/normal then click on "flash stock + unroot". From the dropdown menu choose the new build "LMY48I" under choice "Automatically download..." under settings check "No Wipe" & "Force Flash" than hit ok.
This will flash the new image & keep all your files. When it is done, use Wugs to root & install custom recovery again.
I've tried to install just the update through Wugs, but I've too many changes & it always fails.
Flashing the factory image is just as easy, just takes a little longer.
No. You actually need to remove any modifications to the system (like root) before attempting an OTA update. Just reflashing recovery won't cut it.
Honestly, with a Nexus I usually find it easier to just flash the latest factory image once it gets updated without wiping data in the process, then reflash the custom recovery of your choice, and flash the latest superuser.zip from custom recovery. Much less tedious.
hstroph
Android Expert
May I ask how one accomplishes that "... without wiping data in the process ..." please, given:
occam-lmy48m/
occam-lmy48m/radio-mako-m9615a-cefwmazm-2.0.1701.07.img
occam-lmy48m/image-occam-lmy48m.zip
occam-lmy48m/flash-all.bat
occam-lmy48m/bootloader-mako-makoz30f.img
occam-lmy48m/flash-all.sh
occam-lmy48m/flash-base.sh
Does "flash-all" wipe data, or should I just do a subset?
If you look inside the flash-all script (.bat/.sh, as appropriate for your OS), there's a line that includes something about "fastboot update -w image-occam-lmy48m.zip". The -w indicates "wipe". Remove the -w from that command, save the file, and execute the script.
See also instructions here, just remember to omit the -w when you get to it.
hstroph
Android Expert
If you look inside the flash-all script (.bat/.sh, as appropriate for your OS), there's a line that includes something about "fastboot update -w image-occam-lmy48m.zip". The -w indicates "wipe". Remove the -w from that command, save the file, and execute the script.
See also instructions here, just remember to omit the -w when you get to it.
Thank you, easily done. Not sure why the coding team would include the -w option to begin with, as it would seem to cause much grief.
Well the factory images are really intended for a clean start for development devices, so I totally get that being the default. 
Nice that there's just a single argument to get around it though!
Nice that there's just a single argument to get around it though!