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Some questions after rescuing my phone from a soft brick

So I originally rooted my s3 with the GS3_debugfs-root_r2.7z method, flashed CWM and unlocked my bootloader. Since then i have flashed several roms and all was well until a couple days ago when i decided to restore my first backup in order to retrieve some data. I was still on G7 and kept getting the notification of the HE update. Even though I excepted the OTA and let it fail in CWM i kept get getting the notice almost every time i turn on my phone. I was getting so annoyed with it that i decided to flash a rom with HE in hopes that that would stop the OTA. In this whole process of restoring my backup my bootloader must have locked and when i flashed the rom I got stock on that "unauthorized software, contact Verizon screen". It freaked me out when i couldn't boot into recovery.
I followed the whole Odin, root66 method and was able to save my phone...phew... but have a couple questions now.
1) my phone has the superuser app and it shows that it cannot be uninstalled, like a system app but yet root checker says i am not rooted? Why is this.
2) Would installing supersu and updating binaries get me rooted again?
3) This one is just for curiosity..The message when i soft bricked my phone said you have unauthorized software and to go see a Verizon store. Would they really have been able help me or just tell me i am SOL
ps. Thank you to the XDA community for sharing instructions like the one i used to save my phone.

microdot said:
1) my phone has the superuser app and it shows that it cannot be uninstalled, like a system app but yet root checker says i am not rooted? Why is this.
2) Would installing supersu and updating binaries get me rooted again?
3) This one is just for curiosity..The message when i soft bricked my phone said you have unauthorized software and to go see a Verizon store. Would they really have been able help me or just tell me i am SOL
Click to expand...
Click to collapse
2: That could work, but so should loading the default SU and updating binaries.
3: They would not have been likely to help you, and may have even voided your warranty.

Going to a store would have yielded a bunch of head scratching and them telling you to file an insurance claim.
In the future if you want to block ota's freeze sdm and fwupdate in titanium.

Super SU binaries not installing.

http://forum.xda-developers.com/showthread.php?t=2699089&page=40
I tried using that method to root my phone, but Super SU just won't install binaries. First time around it just wouldn't work, after a few tries I unrooted my device and started over. I got the same message, "Unable to install, reboot"
Then after that it said something like "If you upgraded to 4.3 then reroot" Something like that. Which is weird because I have 4.4.2.
What's going on? I tried Superuser but when I tried installing the binaries it crashed when it was doing a software update twice so I had to hold down on volume up and the power button to reboot it on both occasions.
Also, how do I do an ADB Reboot? What's the easiest method? I tried doing that on my PC but it keeps saying device not detected Maybe I'm not setting up the program for that right? Yes, Developer Options and USB Debugging are enabled.
Yes my M8 is from Verizon. Is there another method for one-click rooting?

Anyone?

CannedBullets said:
http://forum.xda-developers.com/showthread.php?t=2699089&page=40
I tried using that method to root my phone, but Super SU just won't install binaries. First time around it just wouldn't work, after a few tries I unrooted my device and started over. I got the same message, "Unable to install, reboot"
Then after that it said something like "If you upgraded to 4.3 then reroot" Something like that. Which is weird because I have 4.4.2.
What's going on? I tried Superuser but when I tried installing the binaries it crashed when it was doing a software update twice so I had to hold down on volume up and the power button to reboot it on both occasions.
Also, how do I do an ADB Reboot? What's the easiest method? I tried doing that on my PC but it keeps saying device not detected Maybe I'm not setting up the program for that right? Yes, Developer Options and USB Debugging are enabled.
Yes my M8 is from Verizon. Is there another method for one-click rooting?
Click to expand...
Click to collapse
Probably the last thing you wanna do but if it wont work have you considered a factory reset? Usually solves most issues & are you S-OFF? Asking the S-OFF question because if you are you can flash a custom recovery and just flash the binaries. 0% failure rate with that as far as I know. About the ADB Reboot question, did you install the HTC Sync Manager so it would install the proper drivers and then removed the Sync program (not drivers)?

S1L3nTShaDoWz said:
Probably the last thing you wanna do but if it wont work have you considered a factory reset? Usually solves most issues & are you S-OFF? Asking the S-OFF question because if you are you can flash a custom recovery and just flash the binaries. 0% failure rate with that as far as I know. About the ADB Reboot question, did you install the HTC Sync Manager so it would install the proper drivers and then removed the Sync program (not drivers)?
Click to expand...
Click to collapse
I have not considered a factory reset. Also, what's S-OFF? I'm not sure what that is. Also do you mean the HTC Transfer Tool? I don't have that.

CannedBullets said:
I have not considered a factory reset. Also, what's S-OFF? I'm not sure what that is. Also do you mean the HTC Transfer Tool? I don't have that.
Click to expand...
Click to collapse
I don't really know how to explain what "S" is other than its security/signature verification(not sure on signature verification), when your phone is S-ON you can't flash any non verified rom or write to protected areas of your phone such as /system which is required for root, etc and I know it does more than that but I'm not 100% educated as to what it means yet though so can't give you a 100% accurate or complete explanation.
Now based off of what I just said and a little research i'm quite sure you actually require it for a permanent root solution such as SuperSU but could be wrong.
Anyways if you're interested in doing it go here: http://forum.xda-developers.com/showthread.php?t=2708628 and follow the instructions carefully. This also unlocks your bootloader which means you can install custom roms, kernels, flash scripts, apps, SuperSU for PERMANENT root, etc. In order to do these things you'll need to flash a custom recovery such as TWRP or CWM (Team Win Recovery Project & Clockwork Mod/Philz Touch). Afterwards it's quite simple from there on out, just be careful and research before you do anything I've suggested/stated. Also on the Sync Manager thing, what you need to do is install it from here http://www.htc.com/us/support/software/htc-sync-manager.aspx and then let it install the phone drivers for your M8 on your computer and then you need to uninstall it "HTC Sync Manager" from your computer in order to do the S-OFF process.
Please do be careful and get a good understanding before you do this though, re-read things a few times and make sure you're well aware of what it means and how to do it properly.

S1L3nTShaDoWz said:
Probably the last thing you wanna do but if it wont work have you considered a factory reset? Usually solves most issues & are you S-OFF? Asking the S-OFF question because if you are you can flash a custom recovery and just flash the binaries. 0% failure rate with that as far as I know. About the ADB Reboot question, did you install the HTC Sync Manager so it would install the proper drivers and then removed the Sync program (not drivers)?
Click to expand...
Click to collapse
S1L3nTShaDoWz said:
I don't really know how to explain what "S" is other than its security/signature verification(not sure on signature verification), when your phone is S-ON you can't flash any non verified rom or write to protected areas of your phone such as /system which is required for root, etc and I know it does more than that but I'm not 100% educated as to what it means yet though so can't give you a 100% accurate or complete explanation.
Now based off of what I just said and a little research i'm quite sure you actually require it for a permanent root solution such as SuperSU but could be wrong.
Anyways if you're interested in doing it go here: http://forum.xda-developers.com/showthread.php?t=2708628 and follow the instructions carefully. This also unlocks your bootloader which means you can install custom roms, kernels, flash scripts, apps, SuperSU for PERMANENT root, etc. In order to do these things you'll need to flash a custom recovery such as TWRP or CWM (Team Win Recovery Project & Clockwork Mod/Philz Touch). Afterwards it's quite simple from there on out, just be careful and research before you do anything I've suggested/stated. Also on the Sync Manager thing, what you need to do is install it from here http://www.htc.com/us/support/software/htc-sync-manager.aspx and then let it install the phone drivers for your M8 on your computer and then you need to uninstall it "HTC Sync Manager" from your computer in order to do the S-OFF process.
Please do be careful and get a good understanding before you do this though, re-read things a few times and make sure you're well aware of what it means and how to do it properly.
Click to expand...
Click to collapse
Yeah I'll have to look into that. I'm not sure if I'll ever flash a custom ROM though on my M8, Sense 6 is good as it is, I need to get Cyanogenmod on my Razr Maxx, Motoblur on it is just slow ever since they updated it to 4.1.2.

CannedBullets said:
Yeah I'll have to look into that. I'm not sure if I'll ever flash a custom ROM though on my M8, Sense 6 is good as it is, I need to get Cyanogenmod on my Razr Maxx, Motoblur on it is just slow ever since they updated it to 4.1.2.
Click to expand...
Click to collapse
Most of the ROM's for the M8 are Sense based anyways so you won't have a problem if you want Sense.

S1L3nTShaDoWz said:
Most of the ROM's for the M8 are Sense based anyways so you won't have a problem if you want Sense.
Click to expand...
Click to collapse
I just had a strange morning. What's new right? This morning I saw that my Titanium Back had a superuser fail. I had no problems yesterday. I used SuperSU to root and checked to see if Titanium Back was granted rights and it was. Still no luck running it. So Titanium suggested I load Superuser which I was not running. I installed it and it said it could not update the binary. That's weird so I read this post and reflashed SuperSU and yep Titanium backup was denied in the grant list. I granted it and everything is OK now. I posted here because I saw an unusual program in the grant list in SuperSU. It is com.koushikdutta.superuser. I don't know what that is but I bet that was the culprit. It did not show before I updated so it was hidden. Anybody know where this came from?

Weaksauce will not install binaries that's why it needs to reroot your phone every time you reboot. If you want your root to stick you need to be S-OFF. Since you are on 4.2.2 you could try Firewater to gain S-OFF. (Only works for some M8'S on 4.2.2)
http://firewater-soff.com/instructions/
If firewater does not work then you need to use Sunshine which I believe it cost $25. (Will not work on 4.4.4!)
http://forum.xda-developers.com/showthread.php?t=2792487
Not sure if you have adb/fastboot set up on your computer but if not...Google! I know there are instructions on how to set that up because I had to Google it. I think that may be the hardest part of all of this, if you can follow instructions WORD FOR WORD after setting that up I don't see how you can mess up. If you do find yourself stuck well we are here

SOLUTION
CannedBullets said:
http://forum.xda-developers.com/showthread.php?t=2699089&page=40
I tried using that method to root my phone, but Super SU just won't install binaries. First time around it just wouldn't work, after a few tries I unrooted my device and started over. I got the same message, "Unable to install, reboot"
Then after that it said something like "If you upgraded to 4.3 then reroot" Something like that. Which is weird because I have 4.4.2.
What's going on? I tried Superuser but when I tried installing the binaries it crashed when it was doing a software update twice so I had to hold down on volume up and the power button to reboot it on both occasions.
Also, how do I do an ADB Reboot? What's the easiest method? I tried doing that on my PC but it keeps saying device not detected Maybe I'm not setting up the program for that right? Yes, Developer Options and USB Debugging are enabled.
Yes my M8 is from Verizon. Is there another method for one-click rooting?
Click to expand...
Click to collapse
**SOLUTION**
Download the SuperSU ZIP from the link below;
http://download.chainfire.eu/supersu
Reboot your device into your custom recovery of choice, install the ZIP (which should be in your download folder on "sdcard" by default), reboot.
It should now work with no issues!

KnightAlex said:
**SOLUTION**
Download the SuperSU ZIP from the link below;
download.chainfire.eu/supersu
Reboot your device into your custom recovery of choice, install the ZIP (which should be in your download folder on "sdcard" by default), reboot.
It should now work with no issues!
Click to expand...
Click to collapse
I installed CM13 on my Moto G 1st Gen also GApps, I also had TWRP working. So my next step was to install SuperSU (UPDATE-SuperSU-v2.46.zip) with TWRP, after it says it was succesfull, i wanted to reboot the system, it is stuck in the Cyanogenmod Bootanimation and won't boot into the system. And It also stuck in the TWRP loading screen when i want to load into recovery!
What can I do? I have still files on the phone which I want to preserve!

Umm. This is a HTC one m8 forum?

Rooted but really not rooted?!?!

I have an HTC One M8 verizon phone with 4.4 kitkat installed and I recently bought sunshine for $25 and looked everywhere to get s-off and I finally have cyanogenmod 12 on my phone.
The thing that trips me out here though is that I somehow with the steps that I found online I was able to successfully manage to root my phone and download twrp recovery and flash the roms BUT when I go and look if I am rooted with the Root Checker app it says that I am not rooted. Also, when I turn my phone to bootloader (turning phone off then holding both the power button and the down volume side key) it tells me I have s-off and also unlocked. I was having difficulties with gaining temp root that way I could use sunshine with the weaksauace app but sunshine did its own temp root and after that i was able to start rooting my phone and flashing apps.
I downloaded an app for emoji changer, yeah i dont like the google emojis, it worked for a bit but later on it stopped working and i tried to get the emojis back and it kept asking me if im rooted.
Anybody got any ideas? thats why the title it is what it is lol

your device is not properly rooted
hello, i think u cant successfully root your android device.first install the custom recovery and then before flashing the zip u need to clear the dalvik cache two times.then try

Ia really good aplication ?

ZTE Z830 (Compel) Rooting Thread

ZTE Z830: As some of you (who have recently broke your high-end devices like me!) know this is a cheap "GoPhone" you might have purchased as a replacement. As some of us know: the phones Hardware isn't bad for a low-end device. All very capable. The problem however; THE DAMN RESTRICTIONS ZTE HAS PUT ON THE PHONE.
Here are the problems in case you don't own a Z830:
No Apps are allowed on the SD-card
The bloatware cannot be uninstalled
Almost no internal memory (ZTE claims "4 Gigs of internal storage" but there is only around 800MB when disabling all unnecessary apps)
Anyways if you are stuck like me and have been suckered into buying this prepackaged paperweight. You most likely have one goal: ROOT IT. Which is the main point of this thread; as all of the other forum posts about this phone seem to be with people who have even less knowledge than I have about rooting. I want to figure out how to root this phone so it can live up to its capabilities.
I'm posting here about the methods I've been trying to root this phone with; so someone who has more knowledge about general rooting and coding then they can chime in and add some info.
First Attempt (FAILED) to Root the Device
ALSO KNOWN AS UPDATE.ZIP​The BREAKTHROUGH Information: I've managed to find the stock recovery from the phone's firmware. By pressing Volume Up + Power I got into the phones menu with various options to "update the firmware" It looks like this:
Android system recovery <
Z830V1 . 0 . 0B14
Volume up/down to move
highlight;
Press power to select.
reboot system now
apply update from ADB
wipe data/factory reset
wipe cache partition
apply update from sdcard
apply update from cache
md5 cache
So I tried to the original rooting method and this is what happened
-- Install /sdcard ...
(Installs about 25%)
Package corrupt.
Installation aborted.​
So anyways: I would love some help trying to discover how to root this damn thing. If you own one of these and find some more breakthrough info I would love to know; because I am as well messing with this thing to see if this will ever work.

Just Tried TowelRoot. Doesn't support the z830.

Bump
I didn't want to post a new thread, is there any new information on this front? It doesn't seem like this was a popular enough phone to warrant it's own set of instructions
**************************************
A few of us were successful in finding a perm root. I know the phone has aged a bit now, but it really is a nice cheap spare phone without the bloatware.
The following instructions for the ZMAX worked perfectly but TWRP does not support the touch screen for the z830 so you have to use an OTG mouse to use TWRP. Touch functionality works fine once the entire process is complete. Uninstalling bloatware seems to have to be done with a 3rd party app such as Purify.
https://boycracked.com/2016/04/16/how-to-root-installing-twrp-v3-0-1-recovery-on-zte-zmax-z970/

I have this phone and have been trying various automatic root programs for some time. No luck.

qaz1233 said:
I have this phone and have been trying various automatic root programs for some time. No luck.
Click to expand...
Click to collapse
Yeah it seems like the phone uses some sort of bizarre coding.

........
I try everthing... nothing works....
all apps and PC methods fail...

Does adb work on your device? What are the different modes for your devices? Can you get into the bootloader?
Sent from my Z970 using XDA Free mobile app

TecheTag said:
Does adb work on your device? What are the different modes for your devices? Can you get into the bootloader?
Click to expand...
Click to collapse
Hey, I decided to pitch in as I also have this unfortunate phone. adb does in fact work, but it is crippled. I cannot perform "adb reboot bootloader" as it will simply reboot the phone normally. I tried to boot into the bootloader by pressing volume down+power and was entered into field test mode, as I have come to understand (says FTM on a white rectangle). Volume UP + power does put me in recovery mode, which is cool. Most interestingly, hold UP+DOWN+POWER mounts on my windows machine as ZTE handset diagnostic interface DFU... which apparently is made for flashing firmware with zte's own utility. adb reboot fastboot also just rebooted it normally.
if anyone knows of a useful test i could perform or a could point me towards new strategies i would appreciate it.

Well that sounds promising. It seems like we're breaking new ground here though.

830ingarg said:
Most interestingly, hold UP+DOWN+POWER mounts on my windows machine as ZTE handset diagnostic interface DFU... which apparently is made for flashing firmware with zte's own utility. adb reboot fastboot also just rebooted it normally..
Click to expand...
Click to collapse
Do you think there is something that can be used to flash our own custom firmware on it?

Please someone bump

I have the same phone and it's about worthless without root. Hopefully someone cam figure it out. I would even donate some cash for a solution.

Sort of temporary root achieved with KingRoot
So, I have this goofy phone and I did manage to get something that appears to be root using KingRoot. The PC version didn't work, and neither did TowelRoot or OneClickRoot. Downloading the apk for KingRoot and running it gave me root access, but only until I rebooted the phone. I managed to install SuperSU which allowed me to confirm that I had root. Unfortunately I was not able to uninstall any pre-loaded software while rooted via KingRoot or KingUser. KingRoot acted like it had successfully uninstalled the pre-installed software, but all it uninstalled were the updates. I didn't get a list of software when I tried to uninstall software via KingUser.
So we can boot into Recovery, and can get temporary root. Any ideas on how to get farther with this crippled phone?

pippinstrano said:
So, I have this goofy phone and I did manage to get something that appears to be root using KingRoot. The PC version didn't work, and neither did TowelRoot or OneClickRoot. Downloading the apk for KingRoot and running it gave me root access, but only until I rebooted the phone. I managed to install SuperSU which allowed me to confirm that I had root. Unfortunately I was not able to uninstall any pre-loaded software while rooted via KingRoot or KingUser. KingRoot acted like it had successfully uninstalled the pre-installed software, but all it uninstalled were the updates. I didn't get a list of software when I tried to uninstall software via KingUser.
So we can boot into Recovery, and can get temporary root. Any ideas on how to get farther with this crippled phone?
Click to expand...
Click to collapse
Did you actually gain any space when you uninstalled items with that temporary root? I am able to uninstall updates on default apps even without root. I had one time with KingoApp where it claimed to be rooted, but I lost it with reboot and haven't gotten it back. Very frustrating. Wish I had avoided the reboot.

nothing works

I too got temporary root with kingroot, got to ambitious with uninstalling system apps and got into a force close loop. A factory reset from the stock recovery got me back in business. I didn't think that a factory reset was supposed to recover apps deleted while in root access. Also kingroot didn't work the first time for me, had to try several times, that was with latest apk, 4.1 I think.

Has anyone contacted zte about a bootloader unlock code? I know most phones it is necessary to unlock the bootloader to gain permanent root access. Plus then maybe we could get a custom recovery. I tried contacting them with no luck.

Talked to zte today, won't give unlock code since it will void warranty. Told them I didn't care about warranty since phone is worthless as is, no luck.

It could work the method used in the ZTE Z970? http://forum.xda-developers.com/general/help/zte-zmax-rooted-kingroot-t3110178

I was able to get temp root with Kingroot but doesn't stick after reboot. Today I got root to stick by using Flashify to flash superuser zip (http://download.chainfire.eu/supersu). I then deleted Kingroot apps. I was able to uninstall some ATT apps but not google apps. I tried SD Card Fix but didn't work and still can't change/mount r/w in root explorer.

Can't find root method for LG Phoenix 2 (LG k371).

Hey all!
I recently bought the LG Phoenix 2 (LG k371) from ATT, and I really want to root it. But alas, I was unable to find any root method that works for my phone. Does anyone know of a method that will currently work for my device? It is running MarshMallow 6.0. I can update with any other info needed.
Thanks!

Lg Phoenix 2 root
KingRoot app will temp root this phone and you can uninstall all the at&t crap just fine but I needs to be re rooted every time you restart the phone I had to uninstall KingRoot my phone keeps randomly rebooting if its rooted with it

siferx said:
KingRoot app will temp root this phone and you can uninstall all the at&t crap just fine but I needs to be re rooted every time you restart the phone I had to uninstall KingRoot my phone keeps randomly rebooting if its rooted with it
Click to expand...
Click to collapse
Tried KingRoot, no dice

BUMP: I really need a method for this...

I have the same phone. Kingroot did work for me. You have to run it several times but it does eventually work. Also had the random reboot issue on occasion but I did get the bloatware off. What I would like to know is once its temp rooted, is there a method to get permanent root? Any custom recoveries that work for this?

Well I totally boned my phone I think. Kingroot works but it caused a lot of instability. It reboots the phone within minutes of getting temp rooted. So I tried supersume to remove kingroot (which seems to also have a pretty bad reputation as far as privacy goes) to replace kingroot with supersu. Everything seemed to go fine, the binary updated and looked good. Once the phone reboots though, it freezes on the AT&T logo. When I try to factory reset the android pops on screen for about 5 seconds and nothing changes. I can't do anything with adb. Whenever I try to list devices the phone is detected but it says it isn't "Authorized". If anyone has any ideas I would really appreciate it.

KippaStep said:
Hey all!
I recently bought the LG Phoenix 2 (LG k371) from ATT, and I really want to root it. But alas, I was unable to find any root method that works for my phone. Does anyone know of a method that will currently work for my device? It is running MarshMallow 6.0. I can update with any other info needed.
Thanks!
Click to expand...
Click to collapse
I'm having the same issue looking for root method for this phone. If I have to convert to lollipop again somehow I will. Please help.

Hydran said:
Well I totally boned my phone I think. Kingroot works but it caused a lot of instability. It reboots the phone within minutes of getting temp rooted. So I tried supersume to remove kingroot (which seems to also have a pretty bad reputation as far as privacy goes) to replace kingroot with supersu. Everything seemed to go fine, the binary updated and looked good. Once the phone reboots though, it freezes on the AT&T logo. When I try to factory reset the android pops on screen for about 5 seconds and nothing changes. I can't do anything with adb. Whenever I try to list devices the phone is detected but it says it isn't "Authorized". If anyone has any ideas I would really appreciate it.
Click to expand...
Click to collapse
Anybody else try Kingroot then Supersume and have the same trouble or had any success?

mnorris0678 said:
Anybody else try Kingroot then Supersume and have the same trouble or had any success?
Click to expand...
Click to collapse
Installing super su when rooted with king will brick Everytime you can temp root to uninstall the at&t bloat but that's about as far as I got phone keeps rebooting every few minutes when rooted I think I'll just get a new phone

I'm really not a fan of the fact that this device de-roots itself on every reboot, I know the developers have more popular models to address, so I'm not complaining. I was just wondering if anyone knows a way to keep that from happening and safely get rid of KingRoot and put SuperSU on instead...

Supersume
Sent from my SM-N910T using XDA-Developers mobile app

root
did you try this guide?
http://forum.xda-developers.com/showthread.php?t=2684210

Stay away from Kingroot and supersume, you are going to brick your phone!!! You'll have to send it in to LG, and your phone will never be the same again!!!
It only takes one attempt of kingroot, and no more security updates from at&t, Error: !!your device is suspected of rooting!!
(even if you uninstall kingroot & unroot)

Phoenix 2 root
Anyone have any advice on hacking into the system somehow to bypass the boot loader in order to fix the bridging problem at&t left us with? Or possibly something like flashily to flash directly to device or so we can disable bootloader security, or bypass at&t security or something like the old school ways hacking the system if possible. I don't understand HW,SW,KERNEL,LINUX,CODE,APPS so its hard for me to hack it myself. Although, I have successfully rooted, flashed supersu and twrp'd my htc one m9. I have been into buildprops and enabled hotspot tethering and disabled data throttle through proxy servers and HSM. I just don't know where or how to start the root procession this device Cuz I'm still a newb. Please no one click root suggestions, I prefer the knowledge not the instant gratification! Thanks in advance!

try this guide
http://forum.xda-developers.com/android/development/guide-root-method-lg-devices-t3049772

update
Any idea how to update the software?
I tried to update on the phone without any result

brito9112 said:
try this guide
http://forum.xda-developers.com/android/development/guide-root-method-lg-devices-t3049772
Click to expand...
Click to collapse
I tried this method but it froze on the last step, I sat there for an hour while my phone was trying to run the script but nothing would happen.

Tried it as well
brito9112 said:
try this guide
http://forum.xda-developers.com/android/development/guide-root-method-lg-devices-t3049772
Click to expand...
Click to collapse
killerfurzeYT said:
I tried this method but it froze on the last step, I sat there for an hour while my phone was trying to run the script but nothing would happen.
Click to expand...
Click to collapse
Yeah I tried that before I attempted to Kingroot and then Supersume. Did the same thing. If anyone knows of a way to de-brick the phone when supersume fails I'd appreciate any help. Not sure it's even possible.

LG k371 is one of the k8 series.
All K8 were compressed at lz4 not the gzip. SuperSU v2.66 (and other previous system-less version of supersu installer) can't decompress LZ4-compressed kernel. So that procedure won't finish the last step.
There might be two ways to solve this issue, either repacking into gzip, or waiting for supersu's support to lz4.
I guess the supersu's support to lz4 could be easier. But I don't think ppl are working on it.
At that thread, someone succeed rooting another K8 model (LG K8 k350n), with a different chipset, Mediatek MT6735 . I guess you could check it out.
http://forum.xda-developers.com/apps/supersu/install-systemless-supersu-patch-lz4-t3475765
http://www.chinaphonearena.com/forum/printthread.php?tid=16681
http://forum.xda-developers.com/apps/supersu/supersu-v2-66-installed-lz4-compressed-t3296508
Hydran said:
Yeah I tried that before I attempted to Kingroot and then Supersume. Did the same thing. If anyone knows of a way to de-brick the phone when supersume fails I'd appreciate any help. Not sure it's even possible.
Click to expand...
Click to collapse

Did you try booting the phone into fast boot settings?