[Q] Root for H812 (Bell) Running Marshmallow? - G4 Q&A, Help & Troubleshooting

Hey everyone,
I have searched for quite a while and simply couldn't find a root method for my Canadian G4 running Marshmallow. If there is none, is it possible to downgrade? It doesn't seem to me like there is any root for any model running Marshmallow
Thanks,
Dan

Root is not available for the H812 on Marshmallow. Yes, you can downgrade to Lollipop and install root. However, you would lose all your data if you do this.
Check these posts for steps on flashing Lollipop back on your device:
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803

sleepy_76 said:
Root is not available for the H812 on Marshmallow. Yes, you can downgrade to Lollipop and install root. However, you would lose all your data if you do this.
Check these posts for steps on flashing Lollipop back on your device:
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
Click to expand...
Click to collapse
I can't find a link for Bell H812 20E. I don't mind downgrading from MM to LP.

h812 Marshmallow Root
magickarle said:
I can't find a link for Bell H812 20E. I don't mind downgrading from MM to LP.
Click to expand...
Click to collapse
Hi everyone,
I have been searching high and low for a proper method to root this otherwise useless device. Does anyone have a guide that actually works for them to obtain root on Bell LG G4 (h812) on Marshmallow?
I will downgrade if necessary, data loss is not an issue at this point.
I am also wanting to use alternate ROM if any are available for this device.
ON a separate note, is there another model of the LG G4 that is interchangable with the h812 that I can safely use it's ROMs and Root method, or does it HAVE to be specifically for the h812 model?
Thank Kindly!!

905jay said:
Hi everyone,
I have been searching high and low for a proper method to root this otherwise useless device. Does anyone have a guide that actually works for them to obtain root on Bell LG G4 (h812) on Marshmallow?
I will downgrade if necessary, data loss is not an issue at this point.
I am also wanting to use alternate ROM if any are available for this device.
ON a separate note, is there another model of the LG G4 that is interchangable with the h812 that I can safely use it's ROMs and Root method, or does it HAVE to be specifically for the h812 model?
Thank Kindly!!
Click to expand...
Click to collapse
The only way to root LG G4 on MM (for now) is to downgrade it to LP and then copy over a rooted image using DD command.

Thanks. Would you know where I could find a proper guide for bell h812? It's my daily driver ....

frolovvl said:
The only way to root LG G4 on MM (for now) is to downgrade it to LP and then copy over a rooted image using DD command.
Click to expand...
Click to collapse
So once you downgrade to lolipop and root, how can you bring it back to marshmellow?

Check this out and read EVERYTHING carefully ...
905jay said:
Thanks. Would you know where I could find a proper guide for bell h812? It's my daily driver ....
Click to expand...
Click to collapse
Check this out and read EVERYTHING carefully (EVERYTHING you need is there) ... [Canadian Guide] - Complete Source for the LG G4 H812. Linux VM/Root/Tools&Files: https://forum.xda-developers.com/g4/general/canadian-guide-complete-source-lg-g4-t3212449
Once done: then check this out for a custom recovery - [LOCKED][G4][TWRP][UNOFFICIAL] TWRP-in-FIsH for all locked G4 devices:
https://forum.xda-developers.com/g4/development/locked-twrpinfish-locked-g4-devices-t3573048
- use version 3 Beta 4 first, linked in post # 193: for me it has been the most stable:
Enjoy
S.
---------- Post added at 07:33 PM ---------- Previous post was at 07:19 PM ----------
BIG_BADASS said:
So once you downgrade to lolipop and root, how can you bring it back to marshmellow?
Click to expand...
Click to collapse
Use LGUP - NEW (https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803), re-install the stock Lollipop rom (kdz) you used (before flashing the rooted image you used to get root), then ... upgrade again with LGUP - NEW with the appropriate MM kdz (you can check here for that): https://lg-firmwares.com/lg-h812-firmwares/
Suggest you read the Canadian Guide referenced above, thoroughly as well.
S.
PS - Remember the Thanks button.

sdembiske said:
Check this out and read EVERYTHING carefully (EVERYTHING you need is there) ... [Canadian Guide] - Complete Source for the LG G4 H812. Linux VM/Root/Tools&Files: https://forum.xda-developers.com/g4/general/canadian-guide-complete-source-lg-g4-t3212449
Once done: then check this out for a custom recovery - [LOCKED][G4][TWRP][UNOFFICIAL] TWRP-in-FIsH for all locked G4 devices:
https://forum.xda-developers.com/g4/development/locked-twrpinfish-locked-g4-devices-t3573048
- use version 3 Beta 4 first, linked in post # 193: for me it has been the most stable:
Enjoy
S.
---------- Post added at 07:33 PM ---------- Previous post was at 07:19 PM ----------
Use LGUP - NEW (https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803), re-install the stock Lollipop rom (kdz) you used (before flashing the rooted image you used to get root), then ... upgrade again with LGUP - NEW with the appropriate MM kdz (you can check here for that): https://lg-firmwares.com/lg-h812-firmwares/
Suggest you read the Canadian Guide referenced above, thoroughly as well.
S.
PS - Remember the Thanks button.
Click to expand...
Click to collapse
Thank you, this is just what I have been looking for. But do I need to install a custom recovery tool such as TWRP or CWM before I root it? Because the bootloader on the H812 is locked so who knows what flashing might do.

BIG_BADASS said:
So once you downgrade to lolipop and root, how can you bring it back to marshmellow?
Click to expand...
Click to collapse
There's no way to get it back to MM unless you in-root it and use OTA. Unfortunately on all G4 except European variant bootloader is locked and LG doesn't want to open that for us.
---------- Post added at 05:34 PM ---------- Previous post was at 05:33 PM ----------
BIG_BADASS said:
Thank you, this is just what I have been looking for. But do I need to install a custom recovery tool such as TWRP or CWM before I root it? Because the bootloader on the H812 is locked so who knows what flashing might do.
Click to expand...
Click to collapse
As you noticed, the BL is locked. Without unlocking it you'll not be able to install either custom recovery on H812.

You are WRONG ...
frolovvl said:
There's no way to get it back to MM unless you in-root it and use OTA. Unfortunately on all G4 except European variant bootloader is locked and LG doesn't want to open that for us.
---------- Post added at 05:34 PM ---------- Previous post was at 05:33 PM ----------
As you noticed, the BL is locked. Without unlocking it you'll not be able to install either custom recovery on H812.
Click to expand...
Click to collapse
Read the post regarding TWRP-in-Fish, it allows a custom recovery WITH a locked bootloader and has been tested by me on my H812, ReeS86 (who led the way on the H812) and many others with different models with locked bootloaders - do not proclaim what you do not know. You CAN restore back to MM by re-installing the stock Lollipop KDZ with LGUP - NEW and then, using LGUP - NEW again, upgrade back to MM stock provided you have the right KDZ. You cannot however, install a custom rom, as yet. It is being worked on, however, by steadfasterX, first on unlocked bootloaders, then on locked bootloaders ... with a little luck and a lot of his hard work we will have the ability at that point
Do your homework before making proclamations, please!
S.
---------- Post added at 10:59 PM ---------- Previous post was at 10:41 PM ----------
BIG_BADASS said:
Thank you, this is just what I have been looking for. But do I need to install a custom recovery tool such as TWRP or CWM before I root it? Because the bootloader on the H812 is locked so who knows what flashing might do.
Click to expand...
Click to collapse
No, No ... no - please read the posts in the links thoroughly ... you install TWRP-in-FisH AFTER u have got a rooted system image installed. YOU WILL NOT (repeating ad nauseam) BE ABLE TO INSTALL A CUSTOM ROM (at this point any way, until we have a successful efidroid port to a locked LG G4), as you will still have a locked bootloader. You will simply have a way to get back to where you have gotten to at any point in time and if you suffer a hardware bootloop you will be able to get back to where u were once your phone is repaired. And please note, if and when in TWRP (from the TWRP-in-FisH install), it asks you if u want to install TWRP, do not respond Yes - you will brick as it tries to install to your stock recovery partition which cannot be done with a locked bootloader.
Just read all the posts thoroughly, please.
Good Luck,
S.

Thank you Sir! you're right, you can install a body without a head...
sdembiske said:
Read the post regarding TWRP-in-Fish, it allows a custom recovery WITH a locked bootloader and has been tested by me on my H812, ReeS86 (who led the way on the H812) and many others with different models with locked bootloaders - do not proclaim what you do not know. You CAN restore back to MM by re-installing the stock Lollipop KDZ with LGUP - NEW and then, using LGUP - NEW again, upgrade back to MM stock provided you have the right KDZ. You cannot however, install a custom rom, as yet. It is being worked on, however, by steadfasterX, first on unlocked bootloaders, then on locked bootloaders ... with a little luck and a lot of his hard work we will have the ability at that point
Do your homework before making proclamations, please!
S.
---------- Post added at 10:59 PM ---------- Previous post was at 10:41 PM ----------
No, No ... no - please read the posts in the links thoroughly ... you install TWRP-in-FisH AFTER u have got a rooted system image installed. YOU WILL NOT (repeating ad nauseam) BE ABLE TO INSTALL A CUSTOM ROM (at this point any way, until we have a successful efidroid port to a locked LG G4), as you will still have a locked bootloader. You will simply have a way to get back to where you have gotten to at any point in time and if you suffer a hardware bootloop you will be able to get back to where u were once your phone is repaired. And please note, if and when in TWRP (from the TWRP-in-FisH install), it asks you if u want to install TWRP, do not respond Yes - you will brick as it tries to install to your stock recovery partition which cannot be done with a locked bootloader.
Just read all the posts thoroughly, please.
Good Luck,
S.
Click to expand...
Click to collapse
:crying:

Related

[rooted] H815 can't OTA update because of TWRP

Hi folks,
Almost everything is in the subject.
I'm absolutely convinced I'm not the first one to experience this, but I can't find any thread about it ...
My LG G4 H815 is rooted with TWRP installed. I've got the OTA notification for a V20d-JAN-15-2016 (actually running V10d-EUR-XX).
I can download and initiate the update, but my phone reboots in TWRP (instead of bootloader I suppose ?) and the update hangs here.
Is there a way to go through this ?
Thx
Diego
Narsil said:
Hi folks,
Almost everything is in the subject.
I'm absolutely convinced I'm not the first one to experience this, but I can't find any thread about it ...
My LG G4 H815 is rooted with TWRP installed. I've got the OTA notification for a V20d-JAN-15-2016 (actually running V10d-EUR-XX).
I can download and initiate the update, but my phone reboots in TWRP (instead of bootloader I suppose ?) and the update hangs here.
Is there a way to go through this ?
Thx
Diego
Click to expand...
Click to collapse
Once you put a custom recovery on your device or make any other system changes it blocks the ota from being installed and even if the ota went through (which it can't) you'll lose root , you should already know this information ...
---------- Post added at 11:16 PM ---------- Previous post was at 11:14 PM ----------
Oh and p.s when you rooted your phone you should of gone in the settings and unticked for the system to check for updates automatically , if you didn't do that then do it now ...
Xceeder said:
Once you put a custom recovery on your device or make any other system changes it blocks the ota from being installed and even if the ota went through (which it can't) you'll lose root , you should already know this information ...
---------- Post added at 11:16 PM ---------- Previous post was at 11:14 PM ----------
Oh and p.s when you rooted your phone you should of gone in the settings and unticked for the system to check for updates automatically , if you didn't do that then do it now ...
Click to expand...
Click to collapse
You're right I should, but I never faced this limitation on my prior phones (nexus/samsung/moto), so I didn't !
But I'm still confident there is a solution !
If you have twrp, you should flash the v20d flash files, offered in the general section the g4 forum
Sent from my LG-H815 using Tapatalk
ObiDanKenobi said:
If you have twrp, you should flash the v20d flash files, offered in the general section the g4 forum
Sent from my LG-H815 using Tapatalk
Click to expand...
Click to collapse
Didn't find any flashable v20d file in the forum. Did I miss something?
Narsil said:
Didn't find any flashable v20d file in the forum. Did I miss something?
Click to expand...
Click to collapse
Sure did. Very easily found.
http://forum.xda-developers.com/showthread.php?t=3301366
LG Bridge is a solution
Narsil said:
Hi folks,
Almost everything is in the subject.
I'm absolutely convinced I'm not the first one to experience this, but I can't find any thread about it ...
My LG G4 H815 is rooted with TWRP installed. I've got the OTA notification for a V20d-JAN-15-2016 (actually running V10d-EUR-XX).
I can download and initiate the update, but my phone reboots in TWRP (instead of bootloader I suppose ?) and the update hangs here.
Is there a way to go through this ?
Thx
Diego
Click to expand...
Click to collapse
You can use LG Bridge app to update your phone as long you use original LG rom.
No need to create account even, unless you want to use backup feature.
EDIT: You will need to root the phone again after the update is finished (bootloader remains unlocked).
Confirming above for H815 EU rooted and bootloader unlocked, coming from v20D.
The notifications to update were really annoying me so i bit the bullet...
Update via LG bridge - all apps and data retained, but lost root and TWRP.
Followed this guide (again!) to install TWRP and gain root (scroll down til you find the relevant bit), hooray.
http://forum.xda-developers.com/tmobile-g4/development/stock-h811-20i-images-kdz-flashable-t3308227
Make sure to use newest SuperSU (v2,76 currently)
Now just got to remember how i disabled the annoying boot sound!
Guys when will people learn if your rooted or twrp you should never attempt to ota best case scenario it wont update worst case other than bricks is hard bricks and or even on unlockable bootloader is complete loss of root. some device manifactueres even went as far as blocking boooader unlock. And unablity to downgrade.
Never ota wait for modified updates. This has always been one of the first rules of rooting next to backups backups backups!!!
obo789 said:
Confirming above for H815 EU rooted and bootloader unlocked, coming from v20D.
The notifications to update were really annoying me so i bit the bullet...
Update via LG bridge - all apps and data retained, but lost root and TWRP.
Followed this guide (again!) to install TWRP and gain root (scroll down til you find the relevant bit), hooray.
http://forum.xda-developers.com/tmobile-g4/development/stock-h811-20i-images-kdz-flashable-t3308227
Make sure to use newest SuperSU (v2,76 currently)
Now just got to remember how i disabled the annoying boot sound!
Click to expand...
Click to collapse
can you specify what are the relevant bits? Because one of the steps in rooting says "fastboot oem unlock (this wipes ALL data!!)", and I really don't want to do that again :angel:
Reinstall twrp (instructions use old twrp, I used newer 3.0.2 version)
fastboot boot twrp-2.8.7.1-h811.img
6. For perm TWRP: In TWRP hit Install > Images... (bottom right corner) > select TWRP.img on ext sdcard > select "recovery" > swipe.
Click to expand...
Click to collapse
Then flash supersu, done!
hey, it seems it worked like a charm, no data lost, very fast, so I am VERY pleased. Thanks a lot, really!

No Marshmallow update - LG G4 LMY47D

I have purchased an LG G4 but I am not getting any Marshmallow update available either by OTA or the LG Bridge tool.
The details of my device are:
Kernel: 3.10.49
Build Number: LMY47D
Software Version: VX10c-EUR-XX
Ideally I don't want to root or manually flash the rom, I have seen reports of people getting MM from the end of last year. Is there something I am missing as it looks like official MM has been out for some time for this device.
Flash with LGUP. You dont need root. Or wait till is relesead to your phone.
gabytzubc said:
Flash with LGUP. You dont need root. Or wait till is relesead to your phone.
Click to expand...
Click to collapse
Hi,
I found the following link:
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
So I can go ahead and use this app to flash the MM rom on my device? Would I need to prep anything first like unlocking bootloader?
From that link I found the following ROMs:
http://storagecow.eu/index.php?dir=Xda/LG+G4/H815/Marshmallow+6.0/
I am a bit confused as to which ROM I would need to use, there are the following:
Europe_H81520C_00_1218.kdz
H81520B_00.kdz
H81520D_00_0115.kdz
TWN H81520b_00_1218.kdz
What is the difference between each of these ROMs? My device at present has VX10c-EUR-XX, would that mean that I would need to use Europe_H81520C_00_1218.kdz?
From the guide is looks like you need to get LGUP to see the device, select the kdz and off you go, is it really as simple as that? No need for custom recovery, bootloader unlock etc?
Finally, is Europe_H81520C_00_1218.kdz the official LG MM rom? I intend to use Android Pay here in the UK so I need to use an official ROM.
Thanks!
ceanth said:
Hi,
I found the following link:
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
So I can go ahead and use this app to flash the MM rom on my device? Would I need to prep anything first like unlocking bootloader?
From that link I found the following ROMs:
http://storagecow.eu/index.php?dir=Xda/LG+G4/H815/Marshmallow+6.0/
I am a bit confused as to which ROM I would need to use, there are the following:
Europe_H81520C_00_1218.kdz
H81520B_00.kdz
H81520D_00_0115.kdz
TWN H81520b_00_1218.kdz
What is the difference between each of these ROMs? My device at present has VX10c-EUR-XX, would that mean that I would need to use Europe_H81520C_00_1218.kdz?
From the guide is looks like you need to get LGUP to see the device, select the kdz and off you go, is it really as simple as that? No need for custom recovery, bootloader unlock etc?
Finally, is Europe_H81520C_00_1218.kdz the official LG MM rom? I intend to use Android Pay here in the UK so I need to use an official ROM.
Thanks!
Click to expand...
Click to collapse
Latest stock marshmallow rom is h815v20d u cand fiind it on http://devtester.ro/projects/lg-firmwares/
U dont need to unlock ur bootloader to flash a stock rom witg LgUp. Btw on devtester u have a option to search the kdz just by enetering ur imei. Hope that is useful for you.
---------- Post added at 11:04 AM ---------- Previous post was at 11:00 AM ----------
So . u need to install latest drivers..check usb debugging on your phone. Download the latest kdz and put it on desktop, start LgUp go to upgrade and them select the kdz from the desktop.after that thick refurbished if u want to instal a clean rom, connect the phone to your pc and pres start on lg up. After couple of minutes ur phone reboots and after that its showing u an upgrade screen. Thats it
gabytzubc said:
Latest stock marshmallow rom is h815v20d u cand fiind it on http://devtester.ro/projects/lg-firmwares/
U dont need to unlock ur bootloader to flash a stock rom witg LgUp. Btw on devtester u have a option to search the kdz just by enetering ur imei. Hope that is useful for you.
---------- Post added at 11:04 AM ---------- Previous post was at 11:00 AM ----------
So . u need to install latest drivers..check usb debugging on your phone. Download the latest kdz and put it on desktop, start LgUp go to upgrade and them select the kdz from the desktop.after that thick refurbished if u want to instal a clean rom, connect the phone to your pc and pres start on lg up. After couple of minutes ur phone reboots and after that its showing u an upgrade screen. Thats it
Click to expand...
Click to collapse
Hi, I entered my IMEI on the devtester site but it is not recognised! Should I be concerned that my IMEI is not being picked up by the website?
What does that character represent after the v20?
I have the H815 EU. The firmware installed on my phone is MM V20D-EUR-XX. My IMEI is also not recognized by those websites. Should I worry too?
Riardon said:
I have the H815 EU. The firmware installed on my phone is MM V20D-EUR-XX. My IMEI is also not recognized by those websites. Should I worry too?
Click to expand...
Click to collapse
No. My imei is not recognised neither. But i got the OTA So dont worry. The kdz for your imei its not online thats why u dont find nothing. Just flash the v20d euro kdz.
I flashed h815v20d and my device is up and running with MM, yay!
Not had a chance to use it yet but the process was very simple and I had no issues.
I am glad that u made it. hope the info was helpful

LG G3 D850 -Android 6-help needed for rooting

Hi ,
I just got my lg g3 d850 at&t- marshmallow(Android 6) and those AT & T Apps are so annoying ,thats why i m trying to root my LG G3 and all the methods are not working gives device not supported error. I have tried purple drake, LG One Click GUI & script, ioroot, and towelroot without success. Can anyone point me to right direction or steps to follow please ,i just want TWRP and flash like cm13 with basic android 6.
Thank you
Sorry, I can't give you specific information here, but I just went through three days of trying to root my D851 t-mobile (finally succeeded last night). You need to know what version of Android 6 that you have on the phone. Go to Settings / About Phone / Software Information. It will be listed as D850nnx, where 'nn' are digits and 'x' is a letter. My understanding is that the first A6 release for these phones is usually rootable. If it is a release later than that, it may very well not be rootable.
BTW, I am also on AT&T, but will use the t-mobile phone because it is easier to root, which was the reason I chose to buy it. On the D851, the first A6 release was D85130D. They have already rolled out the second release, but many of the phones have not OTA'd or been flashed yet.
---------- Post added at 11:43 AM ---------- Previous post was at 11:38 AM ----------
After finding out what Android release you have, then do a search for "g3 d850nnx root", replacing the nnx with the info you got from the phone settings.
So far only kingroot let me have root access for few minutes and then its stops working.I was able to remove bloatwares from it ,phew.
But not able to flash TWRP or any recovery cause root access stays for few minutes.
i will try with the name as suggested also and will share if it works.
But is there no way around to do it on android 6 yet,really?
Thank you

Can Nougat work on AT&T model

Can Nougat work on AT&T any roms. im getting a phone soon and im hoping i can get other than Marshmallow on my phone. Can someone direct me the steps to do this please?
Any of the ROMs in the "generic/international" M8 development sections will work on the AT&T version. There is no hardware difference between the models. Just stay away from ROMs intended for Sprint and Verizon.
When you receive the phone, you'll want to confirm it's on Marshmallow firmware (and if not, update to MM). Then unlock the bootloader via HTCDev.com, install current TWRP 3.1. Then you can flash any ROM you like (as long as it meets the description already mentioned above).
Looks like you're pretty experienced on these forums (other devices), so may be familiar with some/all of these steps. But if not, or you have any specific questions, let us know and we'll be happy to help further.
redpoint73 said:
Any of the ROMs in the "generic/international" M8 development sections will work on the AT&T version. There is no hardware difference between the models. Just stay away from ROMs intended for Sprint and Verizon.
When you receive the phone, you'll want to confirm it's on Marshmallow firmware (and if not, update to MM). Then unlock the bootloader via HTCDev.com, install current TWRP 3.1. Then you can flash any ROM you like (as long as it meets the description already mentioned above).
Looks like you're pretty experienced on these forums (other devices), so may be familiar with some/all of these steps. But if not, or you have any specific questions, let us know and we'll be happy to help further.
Click to expand...
Click to collapse
Sunshine not required?
cell2011 said:
Sunshine not required?
Click to expand...
Click to collapse
Sunshine not required. S-off is only needed for certain things, like changing the phone's CID/MID, flashing modified hboots, "downgrading" firmware/RUU, SIM unlock.
For most mods, such as root, flashing ROMs (Nougat ROMs included), custom kernels, etc. all you need is an unlocked bootloader and custom recovery TWRP.
redpoint73 said:
Sunshine not required. S-off is only needed for certain things, like changing the phone's CID/MID, flashing modified hboots, "downgrading" firmware/RUU, SIM unlock.
For most mods, such as root, flashing ROMs (Nougat ROMs included), custom kernels, etc. all you need is an unlocked bootloader and custom recovery TWRP.
Click to expand...
Click to collapse
Ok thanks yea thisphone im getting has never been touched meaning rooted or modified probably not even on MM yet. So i should be good to go just update to MM unlock BL and twrp?
My guess is you're buying a carrier unlocked phone? Here is a good thread I started and should answer all your questions.
https://forum.xda-developers.com/htc-one-m8/help/carrier-unlocked-gsm-m8-t3598115
theandies said:
My guess is you're buying a carrier unlocked phone? Here is a good thread I started and should answer all your questions.
https://forum.xda-developers.com/htc-one-m8/help/carrier-unlocked-gsm-m8-t3598115
Click to expand...
Click to collapse
Im sorry i should have been more clearer in my title it will be a US AT&T M8
cell2011 said:
Im sorry i should have been more clearer in my title it will be a US AT&T M8
Click to expand...
Click to collapse
:good: Should still help. When I bought the phone in that thread a few weeks ago on ammmmmmmozon it was advertised as a GSM network phone which AT&T is. I'm on AT&T and it was easy to unlock the bootloader through HTCdev and flash TWRP and custom ROM's and Kernels. As you stated it will probably not be on the latest firmware so you probably have OTA before doing anything. If OTA dosen't work then you'll have to RUU to get on the latest AT&T firmware before unlocking and installing TWRP.
The one think I've had issues with is network speed meaning it indicates HSPA (3G+ speeds) and not 4g or 4g LTE. I've tried all the latest APN's for AT&T's network but still can only get indicated HSPA speeds. This is on an old SIM card and I've not gone to the AT&T store to pick up a new one to see if that is my problem. My SIM is the original one I got when I bought my first M8 shortly after launch in 2014.
I'm currently running LeeDroid (Android 6.0 HTC Sense 7.0) ROM and tomorrow I'm going to try DarkNess reDefined which is Nougut based.
ROM Darkness Redefined
Yes I was told to update to mm and then unlock​ BL and then twrp and root
theandies said:
As you stated it will probably not be on the latest firmware so you probably have to unlock and RUU upgrade before doing anything
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Click to collapse
This is one wrong advise.
OP just needs to OTA update to the latest. If using RUU to upgrade, need a Locked bootloader for S-On device.
Previous advise by @redpoint73 is correct.
After all the firmware is updated to the latest, then only unlock bootloader then install latest TWRP and OP is ready to install custom ROM including Nougat.
---------- Post added at 05:31 AM ---------- Previous post was at 05:27 AM ----------
cell2011 said:
Yes I was told to update to mm and then unlock​ BL and then twrp and root
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Click to collapse
This is correct.
Only thing is you don't need to root because custom ROM is pre-rooted.
You root only if you want a rooted stock ROM
ckpv5 said:
This is one wrong advise.
OP just needs to OTA update to the latest. If using RUU to upgrade, need a Locked bootloader for S-On device.
Previous advise by @redpoint73 is correct.
After all the firmware is updated to the latest, then only unlock bootloader then install latest TWRP and OP is ready to install custom ROM including Nougat.
---------- Post added at 05:31 AM ---------- Previous post was at 05:27 AM ----------
This is correct.
Only thing is you don't need to root because custom ROM is pre-rooted.
You root only if you want a rooted stock ROM
Click to expand...
Click to collapse
If it's a true AT&T phone then yes, just OTA first and foremost. If OTA doesn't work then he'll have to go the RUU route. Once the firmware is up to date (either RUU or OTA) with the latest AT&T then unlock bootloader and install TWRP. I've edited my response as to not confuse. My bad, I just re-read my responce and it didn't come out the way I wanted it to. Guess that's why I'm not an English major..........
Yes this will be an At&t phone not just Sim
cell2011 said:
Yes this will be an At&t phone not just Sim
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Click to collapse
Best thing to do, when you get the phone, is do fastboot getvar all, and post the results (delete IMEI and serial number before posting). We can take a look, and remove all doubt about the carrier version, whether the firmware needs to be updated, etc.

How to update from 4.4.4 KitKat to 6.0 Marshmallow?

Hi everyone, my htc m8 is currently running 4.4.4 KitKat with s-off, unlocked and rooted (sprint) and want to upgrade to Marshmallow 6.0. i have tried to update to Marshmallow earlier but failed to do as got stuck on bootloader wasn't able to get to recovery nor os. I am not sure i have to update firmware or kernal to intall Marshmallow as i am new to this thing. If any one could me help through this procedure i would be thankful.
Downloads and instructions for you can be found in this thread.
Hi. I just received a lot of support for the same problem on the [HELP THREAD].
aweshlakhani said:
i have tried to update to Marshmallow earlier but failed to do as got stuck on bootloader wasn't able to get to recovery nor os.
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Click to collapse
How exactly did you try to "update"? Was it by OTA (unlikely, unless you are actually connected to the US Sprint network). So I assume you tried to flash/install something.
Describe exactly what you did, step by step, and with exact file names and version numbers, for any files you used.
---------- Post added at 10:51 AM ---------- Previous post was at 10:49 AM ----------
Michael Z Freeman said:
Hi. I just received a lot of support for the same problem on the [HELP THREAD].
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Click to collapse
The OP needs to tread carefully. The Sprint version in particular, if flashing the RUU or firmware for another M8 version, it will result in a radio brick (possibly permanent!).

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