How to Unlock Bootloader, Flash TWRP, and ROOT LG G4 H811 T-Mobile.

[Villagers Odyssey]

Now, I know this tutorial exists all over the place, like one-click and UnjustifiedDev tutorial but none seemed to work. I am sharing the steps and method I used IN-DEPTH command for command on how to unlock, flash, and root the LG G4 from Tmobile.

NOTE THIS WILL FACTORY RESET YOUR DEVICE SO BACKUP ALL YOUR DATA

1. Activate developer settings by entering the about section and tapping build number 7 times.
2. Enter your developer settings and MAKE sure you have 'Allow OEM unlock' and 'USB Debugging' enabled.
3. Download the latest SuperSU zip and move it onto your SD card.
4. Using the android issue SDK. Open a command window and link it to your SDK folder where ADB is located (typically Platform-Tools)
5. Once the Command window is linked to the folder, connect your device via USB and allow the connection.
6. On the command window type 'adb reboot bootloader' and the device should reboot with the fastboot options on the upper left of the phone screen
7. Once again on the command window type 'fastboot oem unlock' and the command window should say OKAY and complete the action.
8. To Confirm that the device is unlocked type 'fastboot getvar unlock' and the window should respond with 'Unlock: YES'
9. Now download the latest available TWRP and drop it into the platform-tools folder where your ADB.exe is located.
10. On your Command Window type 'fastboot flash recovery "NAME OF TWRP FILE" if you get the error ' cannot load 'twrp-X.X.X.X-h811' you need to add .img to the end of the filename
11. Once the process completes you will see 'target reported max download size of 536870912 bytes
sending 'recovery' (32968 KB)...
OKAY [ 1.088s]
writing 'recovery'...
FAILED (remote: unknown command)
finished. total time:'
THE FAILED UNKNOWN COMMAND NOTICE CAN BE IGNORED
12. Once the process completes the device may not let you enter recovery from the traditional method using the buttons on the back of the phone so the easiest method is to, on your command window, type
'fastboot boot twrp-2.8.7.0-h811.img' and the device should respond within just a few seconds and reboot into TWRP.
13. Once the device reboots, enter twrp and tap on install and locate the SuperSU.zip and allow it to install.
14. Once the process completes successfully, wipe cache to be safe and reboot your device.
15. Resetup your device and restore your data if necessary and install a root checker from Google Play to confirm root!

THATS IT GUYS! This took me a long time to figure this out and it's a combination of different methods to get it to work!

All credit goes to the Devs of TWRP and SuperSU!

I posted in General because I'm a new user so please move to appropriate forums! thanks!

 

[marcviado]

This thread should be closed as theres already a proper one on here..http://forum.xda-developers.com/tmobile-g4/development/stock-h811-20i-images-kdz-flashable-t3308227

Its more of people really dont like to search and read things

 

[Villagers Odyssey]

Please refer to the first line of my post. I understand that there are a large series of posts about how to do this but this is the only one that works for me even with me running android M.

 

[joeyicecream]

Shows how to install TWRP for devices on 6.0

This thread should be closed as theres already a proper one on here..http://forum.xda-developers.com/tmobile-g4/development/stock-h811-20i-images-kdz-flashable-t3308227

Its more of people really dont like to search and read things

The guide you linked does not show how to unlock the bootloader or install TWRP to allow the install of SU for users that are already on Marshmallow. The other guide would have been perfect if I already had bootloader unlocked and SU installed.

 

[marcviado]

The guide you linked does not show how to unlock the bootloader or install TWRP to allow the install of SU for users that are already on Marshmallow. The other guide would have been perfect if I already had bootloader unlocked and SU installed.

Uhm..like i said nobody likes to read now a days lol. If you look closely the guide i linked shows you how to unlock bootloader,flash twrp,root,downgrade,and have all the files you need.

 

[joeyicecream]

Uhm..like i said nobody likes to read now a days lol. If you look closely the guide i linked shows you how to unlock bootloader,flash twrp,root,downgrade,and have all the files you need.

It is totally there... I looked at that guide for a really long time too. I concede.

 

[Villagers Odyssey]

The guide you linked does not show how to unlock the bootloader or install TWRP to allow the install of SU for users that are already on Marshmallow. The other guide would have been perfect if I already had bootloader unlocked and SU installed.

Yes it does. You do not need to use any codes, just enable oem unlocking in dev settings and type fastboot oem unlock and it will be unlocked.

 

[mr_blonde55]

Can't get twrp installed

Thanks for the step by step directions. I'm having trouble restarting my H811 after I've flashed TWRP. My device doesn't respond to the button method of entering recovery and 'fastboot boot twrp-2.8.7.0-h811.img' command doesn't do anything. My device is 20i and I've unlocked the bootloader. Any ideas? Seems like I've tried everything and can't get TWRP to install. Any help would be great...thanks

 

[zounduser]

I have the G4 LGUS991 gotta can I tell if it's h811?

 

[Modernb]

4. Using the android issue SDK. Open a command window and link it to your SDK folder where ADB is located (typically Platform-Tools)

What if your device could not be found despite having the latest LG drivers?

 

[nh777]

Thanks for the step by step directions. I'm having trouble restarting my H811 after I've flashed TWRP. My device doesn't respond to the button method of entering recovery and 'fastboot boot twrp-2.8.7.0-h811.img' command doesn't do anything. My device is 20i and I've unlocked the bootloader. Any ideas? Seems like I've tried everything and can't get TWRP to install. Any help would be great...thanks

Can't remember which thread, but I ran into the same problem you have and solved it by using an additional command like fastboot erase userdata. If you google it, you'll see the commands I mean. Basically, I had to factory reset the device through fastboot first (it sits there for several minutes to do this) before installing/booting twrp. And yes, the log will show that the process was successful, not a failure as mentioned by OP. Once I did that, I booted in twrp and flashed the rom zip without any trouble.

 

[talvigi]

So, you guys mean we have Marshmallow on T mobile G4, I didn't get it yet.

Please somebody give me a link to the OTA or update.zip for MM of LG G4

 

[Majestyk007]

This one worked for me!

This is the only guide that worked for me.
I unlocked bootloader using adb, no problems...
I tried to flash TWPR with fastboot but kept getting errors. Booting into recovery got a dead android minion and red triangle with ! I ran this stupid recovery a dozen times and read a dozen threads with no obvious answers.
This guide says "ignore the error" and run fastboot boot twrp-2.8.7.1-h811.img which immediately opened TWRP and allowed SuperSU-2.71.zip to be flashed.
The part most guides are missing is the fastboot boot twrp-2.8.7.1-h811.img, so my thanks go here. Some other guides are so difficult to read and follow.
Thanks OP !
Yes, MM Android 6.0 went OTA for T-Mobile a month or so ago...

 

[NardVa]

If you are already on Marshmallow, can't you do the 'fastboot oem unluck' with ADB and install SuperSU through the play store to get root? The part for TWRP would only give you the ablity to flash other roms.

Edit: Nevemind I'm wrong. You need TWRP to install SuperSU which roots the phone. SuperSU in the Play Store will only grant root acess to your apps.

Sent from my LG-H811 using XDA-Developers mobile app

 

[yungpavo]

If you are already on Marshmallow, can't you do the 'fastboot oem unluck' with ADB and install SuperSU through the play store to get root? The part for TWRP would only give you the ablity to flash other roms.

Edit: Nevemind I'm wrong. You need TWRP to install SuperSU which roots the phone. SuperSU in the Play Store will only grant root acess to your apps.

Could you help me with is or point me in the right direction ? Please & thanks

Sent from my LG-H811 using XDA Labs

---------- Post added at 10:55 PM ---------- Previous post was at 10:54 PM ----------

This is the only guide that worked for me.
I unlocked bootloader using adb, no problems...
I tried to flash TWPR with fastboot but kept getting errors. Booting into recovery got a dead android minion and red triangle with ! I ran this stupid recovery a dozen times and read a dozen threads with no obvious answers.
This guide says "ignore the error" and run fastboot boot twrp-2.8.7.1-h811.img which immediately opened TWRP and allowed SuperSU-2.71.zip to be flashed.
The part most guides are missing is the fastboot boot twrp-2.8.7.1-h811.img, so my thanks go here. Some other guides are so difficult to read and follow.
Thanks OP !
Yes, MM Android 6.0 went OTA for T-Mobile a month or so ago...

I keep getting this problem.

Sent from my LG-H811 using XDA Labs

 

[Polarbert]

I've just got a H811 and it automatically updated to Android 6 when I loaded it up. I will be giving this guide a go this evening. Many of the other links on the web are for lollipop and were released when the phone came out, so I'm thankful that this seems straight forward. http://uslugi.nie-spamuj.eu/rtv,1,0.html Hoping that it goes that way.

 

[vohuu]

How to lock bootloader or hide status: bootloader state: unlocked?
Sr for my English!

 

[Juxto2010]

So I followed this guide and I appear to be soft bricked at best and hard bricked at worst. I did read the other guide linked in the second response and I found a major difference that might be my problem. So in the guide linked in the second response it doesn't say to even try flashing TWRP from fastboot. It says to just boot from it then install it from within TWRP. I followed the steps verbatim and my phone is currently stuck at the T-Mobile splash screen. Any suggestions? I have tried to boot into recovery by holding down and the power and releasing the power for a second when the logo comes up. I get into the Factory data reset screen and select Yes twice then the green guy shows up and the phone resets but stays at the T-Mobile splash screen. I don't have ADB or fastboot with the phone in this state.

 

[rmdeathwish]

hi Guys,

So i just wanted to make sure and present my ask -

So, currently twrp flashing and obtaining root is still buggy for those who have android 6.0 preinstalled? Is this a correct assumption?

Also, my ask - I dont want root but i would like a custom recovery so that I may flash custom fonts. My work email (Good for Enterprise) is very much needed (although i hate it to the core).

Can someone please answer me / correct if I mentioned something wrong?

Thanks

 

[Snakecharmed]

hi Guys,

So i just wanted to make sure and present my ask -

So, currently twrp flashing and obtaining root is still buggy for those who have android 6.0 preinstalled? Is this a correct assumption?

Also, my ask - I dont want root but i would like a custom recovery so that I may flash custom fonts. My work email (Good for Enterprise) is very much needed (although i hate it to the core).

Can someone please answer me / correct if I mentioned something wrong?

Thanks

It's not buggy at all. All the tedium has already been bypassed if you already have Marshmallow installed.

Follow autoprime's original guide, steps 2, 4, 5, 6, and 8 under the Bootloader OEM Unlock + Root section. I would recommend a more up-to-date version of TWRP than 2.8.7.1 though. Go to TWRP's download site for the latest version.