Database Users

[Q] 4.1.2 update enquiry after unlocked, rooted. kernel changed

Hi,
I am new to this forum and android stuff.
Please forgive me if I asked noob question.
I tried to search but got no complete answer.
My condition:
Nexus 7
build number JRO03S
used Nexus root toolkit 1.5.3
to unlock and root
used TWRP to install poitee kernel for usb dac.
Then:
The 4.1.2 updates notification show up
I pressed yes ... accidentally.
Now:
The build number becomes JRO03S
but the Android version is still 4.1.1
Question:
a. How to update to 4.1.2?
b. How to update without wiping any data and apps?
c. Do I have to reinstall the pointee kernel?
d. Will flashing rom ( updating to newer version ) wipe all things?
Sorry for so many questions,
For my situation it is a mixed up that I can't find similar condition on the internet yet.
Please kindly help and advise.
Much Thanks!

Btw,
I done below, no success:
1. quickboot
2. TWRP recovery
3. install nakasi-JZO54K-from-JRO03S.zip (from /sdcard)
4. error --> "Status 7" shown.
Cannot update.
Please Please help....

Use the wugs toolkit and go back to fully stock ROM, re lock the bootloader.
Only then will you be able to apply the OTA update.
backup your app data using titanium backup.

There is a modified version of the update that someone made. It doesn't perform the system checks that cause so many peoples devices to fail. If you can't run the update because you changed or deleted a system apk, read this post: http://forum.xda-developers.com/showpost.php?p=32752631&postcount=20
Don't run this if you're just not sure of why your update is failing.

vinny86 said:
Use the wugs toolkit and go back to fully stock ROM, re lock the bootloader.
Only then will you be able to apply the OTA update.
backup your app data using titanium backup.
Click to expand...
Click to collapse
Understood and Thanks a lot!!!:good:
that means all in all,
I still have to go through
the route of "Backup all --> Flash Stock & unroot --> Root --> Restore all".
However, considering the latest update seems don't have anything important or useful to me
So I just wait for the next more important update.
and save the drudgery next time.

vinny86 said:
Use the wugs toolkit and go back to fully stock ROM, re lock the bootloader.
Only then will you be able to apply the OTA update.
backup your app data using titanium backup.
Click to expand...
Click to collapse
He doesn't need to lock his bootloader, and he'll still not be able to run the update the natural way as long as he's got twrp or cwm installed. He can flash the factory rom and push the update through using custom recovery though.

Visa Declined said:
There is a modified version of the update that someone made. It doesn't perform the system checks that cause so many peoples devices to fail. If you can't run the update because you changed or deleted a system apk, read this post: http://forum.xda-developers.com/showpost.php?p=32752631&postcount=20
Don't run this if you're just not sure of why your update is failing.
Click to expand...
Click to collapse
Thanks for you advise,:highfive:
it is very kind of you to help.
I think may be the Status 7 error could be caused by the Custom Kernel Installed (poitee)
I better ask him in detail later on.
But mine is JRO03S,
May be it is safer to Return to Stock Rom completely and go for OTA later.
Sadly, This 4.1.2. seems got no very useful component to me,
I solely use it as a second PDA and Music Player with USB DAC.
I will have to wait for better solution then.....

pleaseabcd said:
However, considering the latest update seems don't have anything important or useful to me
Click to expand...
Click to collapse
The latest update allows you to boot into recovery mode without being plugged into usb. Now, if I get stuck in a bootloop, I don't have to look for something to plug my device into to restore. This feature alone is worth whatever hassle one may have to do to update.

Visa Declined said:
The latest update allows you to boot into recovery mode without being plugged into usb. Now, if I get stuck in a bootloop, I don't have to look for something to plug my device into to restore. This feature alone is worth whatever hassle one may have to do to update.
Click to expand...
Click to collapse
O'really.....em...then it is a different story..(Safer for the future...)
Perhaps, I just:
1. use Titanium Backup to back up everything --> copy the "Back up" to PC (just in case)
2. use Wugfresh Nexus Root Toolkit 1.5.4 to Flash Stock n Root
3. if can Flash to 4.1.2 stock rom directly, OK
4. if can't --> flash back to 4.1.1 stock rom (JRO03S) and then OTA
5. Finally, use Titanium backup to restore Everything.
Have to Thank You you guys again!
I know I am a newbie... but I am learning......
Hate to be limited to what I was given......while I can experiment and make mistake to grow up !:laugh:

[Q] Best first steps with a new tablet

Ultra Noob here
So I had my first android-TF700 for about 10 days. Played around with it, read around this site and realized it was a tablet for someone with experience.
So I now have an N10. Charged, not even turned on yet. What should be my next steps? I see a couple toolkits,an auto root, and ASOP-
What would you suggest a noob start with?
I know, I know, turn it on
Thanks!

Depends on what you want to accomplish with the device. If you want to try or at least gain some understanding as to the different features you might be interested in, read the first post of the different ROMs available and see if anything sounds enticing.
I personally use me for taking media with me on the go, be it news or videos, so I don't have to carry a laptop around. I'm on CM10.1 right now but cycle through every rom to see how everything works. Good luck!
Sent from my Nexus 10 using XDA Premium HD app

First step is unlocking the bootloader and installing root and a custom recovery. Even if you don't need it at the moment there will come the time you want to try it. When you unlock the bootloader you will lose all your data so it's the best if you do it at first when you get your tablet.

rauschkugl said:
First step is unlocking the bootloader and installing root and a custom recovery. Even if you don't need it at the moment there will come the time you want to try it. When you unlock the bootloader you will lose all your data so it's the best if you do it at first when you get your tablet.
Click to expand...
Click to collapse
And how do you unlock the bootloader and install root?
What do you mean a custom recovery?
Are there other ways to root the device with out wiping it? Seems like most android smartphone you can load up an exe or something to shift the su app around or something.
Thanks.. (still waiting for my N10 to arrive.. meanwhile.. still playing with my ICS Bionic)

There are tons of threads here about unlocking the bootloader, rooting and installing a recovery like teamwin or clockworkmod.

rauschkugl said:
There are tons of threads here about unlocking the bootloader, rooting and installing a recovery like teamwin or clockworkmod.
Click to expand...
Click to collapse
Found the threads. Look easy enough to follow. Something I'm not understanding . What does it mean to install a recovery? whats the purpose of that. I've search and (at least not yet) found a good description of what/why that it. I'm sensing that devices are different (duh!) and I didnt need to install a "recovery" on my Droid Bionic when I rooted it, but this N10 must be different.

With the custom recovery you're able to install zip files, make a backup of your Rom,... You can't do that with the recovery that comes with the nexus 10.

Recovery is like a separate system that you can boot to, if you want to mess with the main Android OS. Like rauschkugl said, you can boot to a custom recovery to flash different ROMs that are distributed in flashable ZIP files. You can also make (or if anything goes wrong, revert to) a complete backup of the device's internal memory.

Ok I am rooted and unlocked with mskip's awesome toolkit and DroidModderX video which really helped.
I picked all in one click option and choose TWRP. I fell asleep when I got to TWRP, so I guess I will have to reboot to the recovery page to pull it up.
After that I have no idea what to do I really haven't played with the N10 much. I was planning to leave it stock for awhile (as suggested by rauschkugl).
Do I need to do any backup or anything with TWRP if it's a new tablet? if so what and how ? Please point me to a tutorial for noob types.
Other question is I have a system update and 6 new updates waiting for me to install, can I go ahead and do that rooted and unlocked with stock ROM and no TWRP backup yet?
Thanks!

EraVulgaris said:
Ok I am rooted and unlocked with mskip's awesome toolkit and DroidModderX video which really helped.
I picked all in one click option and choose TWRP. I fell asleep when I got to TWRP, so I guess I will have to reboot to the recovery page to pull it up.
After that I have no idea what to do I really haven't played with the N10 much. I was planning to leave it stock for awhile (as suggested by rauschkugl).
Do I need to do any backup or anything with TWRP if it's a new tablet? if so what and how ? Please point me to a tutorial for noob types.
Other question is I have a system update and 6 new updates waiting for me to install, can I go ahead and do that rooted and unlocked with stock ROM and no TWRP backup yet?
Thanks!
Click to expand...
Click to collapse
Great questions. You are one step ahead of me on my new N10. I've not turned it on yet, really wanting to, but I dont want to do much to it, until after I unlock/root/ and learn how to make backups. Though since i've got a TBpro license, I'll probably use that. I dont want to tweak the OS. so I think I need root just to be able to run TBpro. I just want to be sure I'll still get OFA updates, and I want to learn more about if and how backup work for a multi-user N10.

EraVulgaris said:
Ok I am rooted and unlocked with mskip's awesome toolkit and DroidModderX video which really helped.
I picked all in one click option and choose TWRP. I fell asleep when I got to TWRP, so I guess I will have to reboot to the recovery page to pull it up.
After that I have no idea what to do I really haven't played with the N10 much. I was planning to leave it stock for awhile (as suggested by rauschkugl).
Do I need to do any backup or anything with TWRP if it's a new tablet? if so what and how ? Please point me to a tutorial for noob types.
Other question is I have a system update and 6 new updates waiting for me to install, can I go ahead and do that rooted and unlocked with stock ROM and no TWRP backup yet?
Thanks!
Click to expand...
Click to collapse
I would suggest straight away that you perform a backup with TWRP, so that if you decide to delve deeper into ROMs and playing with your system files, you'll have a completely stock backup to rely on. Simply boot into recovery and select 'Backup', then you can rename the backup file if you want, then swipe the slider across and wait, then you're done!
When it comes to system updates, you'll most likely have to use your root toolkit to unroot the device, else the update will fail. You can however continue to update all your apps as you normally would. Hope this helped

OK
So I kinda started from the beginning of Droid ModderX's video, picked yes to update the toolkit i had donated- (got an update) accessed TWRP (pain to get to- could I download goomanager now after I have TWRP?) and backed up my stock set up just as you said Huggogguh :good:.
Then I went ahead and touched "install system update" that was hanging around in the upper left corner of my tablet (I'm being really specific for other noobs) and it updated my system to 4.2.1 and my apps. Build number changed to JOP4OD
Looked at root checker app. I am now not rooted, so I will go back through toolkit and choose 4 once I am in fastboot mode to reroot I hope:fingers-crossed:.
Thanks!

EraVulgaris said:
OK
So I kinda started from the beginning of Droid ModderX's video, picked yes to update the toolkit i had donated- (got an update) accessed TWRP (pain to get to- could I download goomanager now after I have TWRP?) and backed up my stock set up just as you said Huggogguh :good:.
Then I went ahead and touched "install system update" that was hanging around in the upper left corner of my tablet (I'm being really specific for other noobs) and it updated my system to 4.2.1 and my apps. Build number changed to JOP4OD
Looked at root checker app. I am now not rooted, so I will go back through toolkit and choose 4 once I am in fastboot mode to reroot I hope:fingers-crossed:.
Thanks!
Click to expand...
Click to collapse
Sounds like a great success then so are you saying that you performed the system update while you were rooted and you retained the root access?

Nope. Got the OTA system update and it knocked me off root. But I got it back easily with the toolkit.

How to Root with Minimum Impact

Hi,
I'm expecting my Nexus 4 some time this week and I'd like a little help.
I have a htc one x at the moment. A while after I got it, I decided to unlock it and use custom rom etc.
With the nexus 4, I just want to root it without disrupting anything if possible. The one thing I don't want to mess up is getting the Ota updates as I couldn't get that to work again on my one x.
So to summarise, I want to root my Nexus 4 whilst retaining the ability to get Ota updates and full functionality as normal. Can anyone help?

You'll need adb/fastboot + the appropriate drivers.
-unlock BL via fastboot,
-flash recovery via fastboot,
-flash SU zip via recovery,
-leave BL unlocked, no reason to relock it.
That's it. Don't remove, or rename any system apps if you want the OTA to apply. You can even flash OTA's via a custom recovery, this will likely be available here prior to you getting a notification.
Good info here: http://forum.xda-developers.com/showthread.php?t=2010312

So there is no way to root the device without unlocking the bootloader and flashing the custom recovery?
I'm basically in the same boat. I'm developing android apps and want to use log reading apps but I don't want to have any custom rom/recovery on the phone.

mseebass said:
So there is no way to root the device without unlocking the bootloader and flashing the custom recovery?
I'm basically in the same boat. I'm developing android apps and want to use log reading apps but I don't want to have any custom rom/recovery on the phone.
Click to expand...
Click to collapse
You know when you are on other phones, you are actually unlocking the bootloader via a exploit or through the manufacturers developer center.
You need a custom recovery in order to obtain root. It is a must need, without it you cannot be rooted.
Only way to change your recovery is to unlock the bootloader. Having a locked bootloader locks it so your recovery can't be changed. So.... You get the idea
Sent from my Nexus 4 using xda premium

mseebass said:
So there is no way to root the device without unlocking the bootloader and flashing the custom recovery?
I'm basically in the same boat. I'm developing android apps and want to use log reading apps but I don't want to have any custom rom/recovery on the phone.
Click to expand...
Click to collapse
You can do it via adb with an insecure boot image, outlined here below the CWM method: http://forum.xda-developers.com/showthread.php?t=1993331&highlight=insecure
If you do it the CWM, or TWRP way you can flash the stock recovery again. You absolutely have to unlock the bootloader however, no way around that.
CF Root is another option: http://forum.xda-developers.com/showthread.php?t=2025274

i just want to make sure you know that if by some circumstance you lose ota that you can always just download the zip of the update here and flash in recovery. there really is no reason for ota that i can see on a nexus device. its here as soon as its released pretty much.

phermey said:
i just want to make sure you know that if by some circumstance you lose ota that you can always just download the zip of the update here and flash in recovery. there really is no reason for ota that i can see on a nexus device. its here as soon as its released pretty much.
Click to expand...
Click to collapse
Convenience? With CWM it even patches on first boot so you don't lose root or anything so I like being able to do OTA (well the one update so far) vs. having to connect to my desktop.

threeclaws said:
Convenience? With CWM it even patches on first boot so you don't lose root or anything so I like being able to do OTA (well the one update so far) vs. having to connect to my desktop.
Click to expand...
Click to collapse
no reason to connect to desktop if you have recovery. you can come here on your phone or 'chrome to phone' it over. find the thread. click the download link. then reboot in recovery and flash.

phermey said:
no reason to connect to desktop if you have recovery. you can come here on your phone or 'chrome to phone' it over. find the thread. click the download link. then reboot in recovery and flash.
Click to expand...
Click to collapse
I also could drop it into dropbox but that is all more work than just hitting "install" on my phone, it isn't like updates are released with enough frequency that the amount of work matters but like I said OTA is more convenient for me and CWM made it even more convenient. The OP may have completely different reasons for wanting OTA.

phermey said:
i just want to make sure you know that if by some circumstance you lose ota that you can always just download the zip of the update here and flash in recovery. there really is no reason for ota that i can see on a nexus device. its here as soon as its released pretty much.
Click to expand...
Click to collapse
i think you must have missed that part in bold. no reason to be a smart a$$ either when you are the one who didnt know there is no reason to connect to desktop.
remember... the whole reason for this thread in the first place is because the op lost ota on his last phone by rooting it. all i did was try to let him feel at ease.

ORStoner said:
Hi,
I'm expecting my Nexus 4 some time this week and I'd like a little help.
I have a htc one x at the moment. A while after I got it, I decided to unlock it and use custom rom etc.
With the nexus 4, I just want to root it without disrupting anything if possible. The one thing I don't want to mess up is getting the Ota updates as I couldn't get that to work again on my one x.
So to summarise, I want to root my Nexus 4 whilst retaining the ability to get Ota updates and full functionality as normal. Can anyone help?
Click to expand...
Click to collapse
Just use the nexus 4 toolkit, follow it's directions/steps - Can't get any easier or less impact than that. Install Drivers, unlock bootloader and root. Done. OTA still work, install busybox from the play store if needed.
http://forum.xda-developers.com/showthread.php?t=1995688

phermey said:
i think you must have missed that part in bold. no reason to be a smart a$$ either when you are the one who didnt know there is no reason to connect to desktop.
remember... the whole reason for this thread in the first place is because the op lost ota on his last phone by rooting it. all i did was try to let him feel at ease.
Click to expand...
Click to collapse
I wasn't being a smart ass nor was I unaware of other ways to get an OTA update, you said there was no reason for OTA on a nexus device and I responded why someone would want it.

clockcycle said:
Just use the nexus 4 toolkit, follow it's directions/steps - Can't get any easier or less impact than that. Install Drivers, unlock bootloader and root. Done. OTA still work, install busybox from the play store if needed.
http://forum.xda-developers.com/showthread.php?t=1995688
Click to expand...
Click to collapse
Don't use toolkits take the time and learn how to do it yourself so if you get into situations where you messed something up you know how to fix it as you know how adb and fast boot will work.
Toolkits are not worth the short cut
Sent from my Nexus 4 using xda premium

Can I just unlock the bootloader, fastboot boot not flash cwn and install root from there.
Also, how does unlocking bootloader affect warranty?
Sent from my HTC One X using xda premium

ORStoner said:
Can I just unlock the bootloader, fastboot boot not flash cwn and install root from there.
Also, how does unlocking bootloader affect warranty?
Sent from my HTC One X using xda premium
Click to expand...
Click to collapse
This is the best way to do it. Yes you can fastboot boot cwm so it'll be temp and just install supersu zip. Regarding warranty for bootloader, it originally came locked so should you need to return it, warranty will be voided if you unlock it. However, it would really be just fastboot oem lock if you need to relock it. The state won't show relocked if you do it. It'll be plain locked
Sent from my Nexus 7 using Tapatalk 2

Titanium Backup, Recovery apps, and the noob

Noob for tablets. Got the nexus 10 for the family for christmas. Want to get it all setup before I turn it over to the wolves.
I love using TBpro on my Droid Bionic. I thought it would be good to have a solid backup program on the tablet, and since I have it on my smartphone I thought I would hang with what I've sorta know already.
Dont really understand what unlocked/locked means for a bootloader, and why the N10 needs that why many smartphone can be rooted without being unlocked.
I would love to hear some views on the purposes of apps like ClockWorkMod and TWRP and what they do and provide. Seems like they do perform backups and more. Why TBpro is likely just a backup app. What functions do these recovery apps have the make them "must have".
thanks for the time answering the tablet noob

TBPro requires Root access and to acquire root access you have to be able to modify the operating system. You can't do that until the bootloader is unlocked. Once unlocked, you then need to flash Custom Recovery (either CMW or TWRP) in order to to flash/install the the files required to install the root binaries. Other uses of recovery include making NAND/System Backups and installing custom roms. They are essential if you are into modding your device. I have an LG G2x that is rooted and has a custom rom (CM7.2) and a Custom Kernel (Faux123 v54), as well as Beats Audio for Gingerbread. I installed all of those via ClockworkMod. I followed ZedoMax's instructions to root my Nexus 10 and had only the initial bootloop issue after unlocking the bootloader. That was easy to fix but I couldn't get ClockWorkMod to stay installed so I flashed TWRP instead. Works great. Just follow this thread and watch the vids. Hope I helped some.
http://forum.xda-developers.com/showthread.php?t=1997227

bg1906 said:
TBPro requires Root access and to acquire root access you have to be able to modify the operating system. You can't do that until the bootloader is unlocked. Once unlocked, you then need to flash Custom Recovery (either CMW or TWRP) in order to to flash/install the the files required to install the root binaries. Other uses of recovery include making NAND/System Backups and installing custom roms. They are essential if you are into modding your device. I have an LG G2x that is rooted and has a custom rom (CM7.2) and a Custom Kernel (Faux123 v54), as well as Beats Audio for Gingerbread. I installed all of those via ClockworkMod. I followed ZedoMax's instructions to root my Nexus 10 and had only the initial bootloop issue after unlocking the bootloader. That was easy to fix but I couldn't get ClockWorkMod to stay installed so I flashed TWRP instead. Works great. Just follow this thread and watch the vids. Hope I helped some.
http://forum.xda-developers.com/showthread.php?t=1997227
Click to expand...
Click to collapse
Thanks!
After unlocking, and using CMW or TWRP. I can then "root" my device. ok. After rooting, I can use TBpro.
At this point, do I need to remain "unlocked" Does it matter? For the N10 will I receive OTA after being unlocked/rooted,
or do I need to be in another state?

jetguat said:
Thanks!
After unlocking, and using CMW or TWRP. I can then "root" my device. ok. After rooting, I can use TBpro.
At this point, do I need to remain "unlocked" Does it matter? For the N10 will I receive OTA after being unlocked/rooted,
or do I need to be in another state?
Click to expand...
Click to collapse
Yes to all. Another option for you if you are not comfortable typing in the various commands is to use the Wufresh method. Watch the video by qbking777 here: http://forum.xda-developers.com/showthread.php?t=2015467

bg1906 said:
Yes to all. Another option for you if you are not comfortable typing in the various commands is to use the Wufresh method. Watch the video by qbking777 here: http://forum.xda-developers.com/showthread.php?t=2015467
Click to expand...
Click to collapse
Thanks again. I did stumble across that site and was trying to compare that to the mskip Nexus root tool kit. That was had so many options and I didnt (yet) find the cliff note's version on what they all do and why you'd need to.
The GUI for Wufresh is simple. Do you use it? I read a little about the root and the root+custom recovery choices. Not entirely clear which is preferred, at least for me needs. And I've not got a warm fuzzy feeling about what state the N10 should be in, such that OTA updates still happen. Can they happen when unlocked+rooted+custom recovery but still stock ROM (without system mods)

The wugfresh version automates what the zedomax version does by hand. I did mine via the zedomax way.
Sent from my Nexus 10 using xda app-developers app

jetguat said:
Thanks again. I did stumble across that site and was trying to compare that to the mskip Nexus root tool kit. That was had so many options and I didnt (yet) find the cliff note's version on what they all do and why you'd need to.
The GUI for Wufresh is simple. Do you use it? I read a little about the root and the root+custom recovery choices. Not entirely clear which is preferred, at least for me needs. And I've not got a warm fuzzy feeling about what state the N10 should be in, such that OTA updates still happen. Can they happen when unlocked+rooted+custom recovery but still stock ROM (without system mods)
Click to expand...
Click to collapse
I would suggest using the Wugfresh method, definitely the simplest to use. And a great recovery is TWRP, it is very clear and easy to understand what it is that each menu contains.
Also with the OTA updates, it really depends on the size and type of update. If it is a fairly major one, like JB 4.1 to JB 4.2 then you will have to use the option in Wugfresh toolkit to 'unroot', then update. After the update you can simply reuse the toolkit to root again. Sometimes if the OTA is small it will simply install over the rooted device, but I wouldn't count on it. It definitely shouldn't discourage you from rooting though, its relatively simple to fix

[Q] Bricked by Nexus (and I'm not a techie)

Hi everybody.
Okay I'm not a techie. I managed to root my nexus 4 running android 5.0.1 with kingo root. I wanted the OTA 5.1 UPDATE, so unrooted, tried the OTA and it failed.
I've installed minimal adb and fastboot but after various goes I'm no further on. Is my phone ruined?
Under system recovery I'm now showing LMY470. If I try and reboot I just get the google display.
PLEASE - can anybody help (I go on holiday on Sunday and really need my phone!)
Hope somebody can help
Rob

Just flash the factory image with fastboot.
Download the factory image, extract it. In there is a flash-all batch file
Boot into the bootloader and connect your device to the pc
Double click on the flash-all
Note, this will wipe your device.
Sent from my Nexus 5 using XDA Free mobile app

robigouk said:
Hi everybody.
Okay I'm not a techie. I managed to root my nexus 4 running android 5.0.1 with kingo root. I wanted the OTA 5.1 UPDATE, so unrooted, tried the OTA and it failed.
I've installed minimal adb and fastboot but after various goes I'm no further on. Is my phone ruined?
Under system recovery I'm now showing LMY470. If I try and reboot I just get the google display.
PLEASE - can anybody help (I go on holiday on Sunday and really need my phone!)
Hope somebody can help
Rob
Click to expand...
Click to collapse
Your phone is not ruined.... You may need to have to flash the image again. You might want to try using the "Nexus Root Toolkit"
Just search for it It will walk you through the whole process. You might also search for the SkipSoft Android Tool Kit.
I hope that helps Let us know how you get on

Blacksmith5 said:
Your phone is not ruined.... You may need to have to flash the image again. You might want to try using the "Nexus Root Toolkit"
Just search for it It will walk you through the whole process. You might also search for the SkipSoft Android Tool Kit.
I hope that helps Let us know how you get on
Click to expand...
Click to collapse
All done. manged to put no the original 4.3 and then let it do all the OTA stuff. dont' think I'll be rooting again, put me off!

robigouk said:
All done. manged to put no the original 4.3 and then let it do all the OTA stuff. dont' think I'll be rooting again, put me off!
Click to expand...
Click to collapse
When you say you "unrooted", how did you do so? I have found with 5.+ that in order for the OTA to not fail when you have been rooted, requires that you flash the stock images for the current version, as opposed to Factory Resetting, and then you will be able to install the OTA update without it failing. Has to do with out the updater checks the entire partition and not pieces, which is a new method. If one byte of data is out of place on System partition, it OTA fails.