So I followed a guide off of YouTube on how to root this phone. The steps were simply put use fastboot to enable oem unlocking. Use adb to push twrp. Use twrp to flash supersu walla you have rooted stock rom. I attempted this and got stuck after flashing supersu. The rom would not boot. I let it sit for 15 mins. Held the power button let it try again. Again it didn't boot. So I fiddled with it trying to figure out how to get stock rooted and wasnt able to. I could flash a stock image in twrp and it would boot. But as soon as I flashed supersu it would no longer boot. I read somewhere I needed a different supersu so I tried that one. Just asking simply how can I achieve stocked rooted. I also don't understand the encryption thing this phone has. Apparently you have to delete a partition to get rid of it but at boot it will just encrypt again. Any information on that would be greatly appreciated. Sorry for any spelling or grammar mistakes. Writing this out over my lunch break.
jakeneal22 said:
So I followed a guide off of YouTube on how to root this phone. The steps were simply put use fastboot to enable oem unlocking. Use adb to push twrp. Use twrp to flash supersu walla you have rooted stock rom. I attempted this and got stuck after flashing supersu. The rom would not boot. I let it sit for 15 mins. Held the power button let it try again. Again it didn't boot. So I fiddled with it trying to figure out how to get stock rooted and wasnt able to. I could flash a stock image in twrp and it would boot. But as soon as I flashed supersu it would no longer boot. I read somewhere I needed a different supersu so I tried that one. Just asking simply how can I achieve stocked rooted. I also don't understand the encryption thing this phone has. Apparently you have to delete a partition to get rid of it but at boot it will just encrypt again. Any information on that would be greatly appreciated. Sorry for any spelling or grammar mistakes. Writing this out over my lunch break.
Click to expand...
Click to collapse
I always use this toolkit: https://forum.xda-developers.com/oneplus-3t/development/toolkit-oneplus-3t-toolkit-unlock-t3507729
So far it worked flawlesly and saved me trouble.
jakeneal22 said:
So I followed a guide off of YouTube on how to root this phone. The steps were simply put use fastboot to enable oem unlocking. Use adb to push twrp. Use twrp to flash supersu walla you have rooted stock rom. I attempted this and got stuck after flashing supersu. The rom would not boot. I let it sit for 15 mins. Held the power button let it try again. Again it didn't boot. So I fiddled with it trying to figure out how to get stock rooted and wasnt able to. I could flash a stock image in twrp and it would boot. But as soon as I flashed supersu it would no longer boot. I read somewhere I needed a different supersu so I tried that one. Just asking simply how can I achieve stocked rooted. I also don't understand the encryption thing this phone has. Apparently you have to delete a partition to get rid of it but at boot it will just encrypt again. Any information on that would be greatly appreciated. Sorry for any spelling or grammar mistakes. Writing this out over my lunch break.
Click to expand...
Click to collapse
What version of supersu you installed, and on what version of system you were ?
I was on the latest official version of both as of yesterday. I will try the toolkit when I get home. With this toolkit are you able to root the new 7.1? I tried that out and liked it when attempting to get back to stock. Ultimately the goal is the newest software one plus has to offer with root, snapchat working, and a custom kernel set for better battery life.
You probably flashed an older version of SuperSU, which will cause endless boot animation. The SuperSU included in the toolkit should be the latest stable version. Alternatively, you could root with Magisk, which I have personally found to be easier to install (not as many branched versions) and use. Magisk is not the same as SuperSU, but they both result in the same outcome - systemless root. It's also easier to hide root from other apps (such as Snapchat) using Magisk through the Magisk Manager app. You can find out more about it here: https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445
Toolkit worked perfectly for me. I flashed the latest beta directly from one plus and installed snapchat and logged in. Used the toolkit to root and install franco kernel. Moderator please close this thread.
Are there any issues using adb backup to babkup all apps and restore after unlocking the bootloader? Or is there any better way to backup apps?
Related
Having an issue with the unified rooting tool (http://forum.xda-developers.com/nexus-6/orig-development/toolkit-skipsoft-unified-android-t2967053). Paid for the pro version because i enjoy supporting quality work.
Went to do the all-in-one unlock/recovery/root, however it's not rooting for me. The final step of rooting gets stuck in TWRP and nothing happens. The program says 'Recovery mode not detected' and just hangs asking me to try again, ask for help, or abort.
I have ADB and everything on and working as unified can connect to my phone, just can't get root going.
The phone is now unlocked with TWRP, but I can't achieve root. I flashed 5.0.1 via the app. Anyone have any clues?
edit: did it manually (before reading simms22's post). was hoping for lazy-automated as i paid money for the app and all.
If you have twrp installed just flash SuperSU. The newest version of SuperSU (2.37 or something I think) can be flashed like old days.
lol, learn to root a nexus the right way. its easier than using a toolkit..
1. fastboot oem unlock
2. fastboot flash yourself a recovery
3. flash the latest supersu with that new recovery
4. reboot and profit
root
Just had a problem after using root toolkit to attempt root on nexus 6 with marshmellow. (6.0 ), build MRA58R. After this attempt, got the message that" device is corrupted" and would not boot into system. Luckily bootloader was still unlocked and was able to flash stock image. Phone boots fine now with Boatloader unlcocked, and TWRP is gone, with no root. How do I root from here and install TWRP again without going through what happened before.
In the beginners guide to root, Chanifire's link hasn't been working and I want to be sure I do this right to avoid what happened with the toolkit. Also, my phone is setup with apps and data, and I dont't want to loose my setup.
Thanks for your help.
ccf60 said:
Just had a problem after using root toolkit to attempt root on nexus 6 with marshmellow. (6.0 ), build MRA58R. After this attempt, got the message that" device is corrupted" and would not boot into system. Luckily bootloader was still unlocked and was able to flash stock image. Phone boots fine now with Boatloader unlcocked, and TWRP is gone, with no root. How do I root from here and install TWRP again without going through what happened before.
In the beginners guide to root, Chanifire's link hasn't been working and I want to be sure I do this right to avoid what happened with the toolkit. Also, my phone is setup with apps and data, and I dont't want to loose my setup.
Thanks for your help.
Click to expand...
Click to collapse
rooting marshmallow..
1. unlock the bootloader(yours is there already)
2. fastboot flash twrp recovery.
3. flash the latest supersu in twrp recovery
4. flash a custom marshmallow kernel, any. this ones new for marshmallow, and is needed.
5. boot up.
simms22 said:
rooting marshmallow..
1. unlock the bootloader(yours is there already)
2. fastboot flash twrp recovery.
3. flash the latest supersu in twrp recovery
4. flash a custom marshmallow kernel, any. this ones new for marshmallow, and is needed.
5. boot up.
Click to expand...
Click to collapse
Thank you.
ccf60 said:
Just had a problem after using root toolkit to attempt root on nexus 6 with marshmellow. (6.0 ), build MRA58R. After this attempt, got the message that" device is corrupted" and would not boot into system. Luckily bootloader was still unlocked and was able to flash stock image. Phone boots fine now with Boatloader unlcocked, and TWRP is gone, with no root. How do I root from here and install TWRP again without going through what happened before.
In the beginners guide to root, Chanifire's link hasn't been working and I want to be sure I do this right to avoid what happened with the toolkit. Also, my phone is setup with apps and data, and I dont't want to loose my setup.
Thanks for your help.
Click to expand...
Click to collapse
how did you manage to flash stock again after corrupt. mine wont recognize adb while corrupt. please give step by step
nvm. i got it finally
You don't flash with adb, but with fastboot.
The steps are:
1. Turn on phone with pressing vol down and power.
Sent from my Nexus 6 running cyosp using Tapatalk
Just signed up for the beta program a couple of days ago, downloaded/installed Preview 4 with no issues. I recall it booting back to TWRP, a script ran in TWRP, and then the phone rebooted back to system. Everything was OK at that point, other than I lost root and TWRP. I reflashed TWRP with fastboot, SuperSU via TWRP, and now I'm back in business.
I got the notification a few minutes ago that Preview 5 was now available for me to install. It downloaded, rebooted to TWRP...and nothing. The script didn't run this time like it did last time. Plus, every time I try to boot back to system it goes right back into recovery.
...help?
Same thing for me. I had to run the preview 4 twrp zip
Sent from my Nexus 6 using XDA-Developers mobile app
Gromlakh said:
Just signed up for the beta program a couple of days ago, downloaded/installed Preview 4 with no issues. I recall it booting back to TWRP, a script ran in TWRP, and then the phone rebooted back to system. Everything was OK at that point, other than I lost root and TWRP. I reflashed TWRP with fastboot, SuperSU via TWRP, and now I'm back in business.
I got the notification a few minutes ago that Preview 5 was now available for me to install. It downloaded, rebooted to TWRP...and nothing. The script didn't run this time like it did last time. Plus, every time I try to boot back to system it goes right back into recovery.
...help?
Click to expand...
Click to collapse
You could flash the stock recovery from a factory image then follow the instructions on this page to flash the OTA which will preserve data, but if you don't care about data you could flash the factory image fromthis page. If you don't need the device ASAP you could also wait for RatchetPanda to upload a flashable system on this thread, but IDK how long that'll be (although he's generally pretty fast).
Good news: got the phone to boot by going to bootloader first, then telling it to boot to system from there. So the phone works again, but the update didn't stick.
Will try flashing stock recovery in a bit. Thanks!
Sent from my Nexus 6 using Tapatalk
mrjiggywiggy said:
You could flash the stock recovery from a factory image then follow the instructions on this page to flash the OTA which will preserve data, but if you don't care about data you could flash the factory image fromthis page. If you don't need the device ASAP you could also wait for RatchetPanda to upload a flashable system on this thread, but IDK how long that'll be (although he's generally pretty fast).
Click to expand...
Click to collapse
One quick question: I have the phone booted back up now, and I can get back to recovery (TWRP) whenever I want. The OTA flash instructions from the first link say to use stock recovery + adb sideload to flash. Can I just flash the OTA from TWRP and not mess with stock recovery? I would assume yes, but I figured I'd at least ask the dumb question first before my phone starts bootlooping on me after a bad flash.
EDIT: Never mind, found the answer: apparently not.
Gromlakh said:
One quick question: I have the phone booted back up now, and I can get back to recovery (TWRP) whenever I want. The OTA flash instructions from the first link say to use stock recovery + adb sideload to flash. Can I just flash the OTA from TWRP and not mess with stock recovery? I would assume yes, but I figured I'd at least ask the dumb question first before my phone starts bootlooping on me after a bad flash.
EDIT: Never mind, found the answer: apparently not.
Click to expand...
Click to collapse
nope
Problem ultimately solved by flashing the zip from here: http://forum.xda-developers.com/nexus-6/general/android-n-preview-5-beta-npd90g-t3421459 (method 1). Everything is working just fine now.
So I connected my LG-H811 running stock ROM 20p to my PC successfully and ran adb and fastboot to transfer twrp and supersu over to the phone internal drive. So far so good. I couldn't get twrp to flash properly, so I simply did a temporary boot and got twrp to run without flashing it as a recovery. Then I used twrp to flash supersu (SuperSU-v1.94.zip). The problem is that when I try to reboot, it says the superSU binary is not installed. So I tried newer versions of supersu (SuperSU-v2.76-20160630161323.zip and SuperSU-v2.48.zip). Each time with these newer versions it soft bricked the phone again and required a full stock ROM restore. Specifically, it hangs either on the black LG screen or the white T-mobile screen, while the blue LED flashes on and off every few seconds. To unbrick it each time, I did a restore with stock ROM H811V20p_00_0913.kdz with LGUP. That got it working again with stock ROM, but no root. There must be a way to get superSU to install on 20p (and even get the twrp recovery to flash). I unlocked the bootloader, and it seems to load, so apparently that's not the issue. Thanks.
theprof7 said:
So I connected my LG-H811 running stock ROM 20p to my PC successfully and ran adb and fastboot to transfer twrp and supersu over to the phone internal drive. So far so good. I couldn't get twrp to flash properly, so I simply did a temporary boot and got twrp to run without flashing it as a recovery. Then I used twrp to flash supersu (SuperSU-v1.94.zip). The problem is that when I try to reboot, it says the superSU binary is not installed. So I tried newer versions of supersu (SuperSU-v2.76-20160630161323.zip and SuperSU-v2.48.zip). Each time with these newer versions it soft bricked the phone again and required a full stock ROM restore. Specifically, it hangs either on the black LG screen or the white T-mobile screen, while the blue LED flashes on and off every few seconds. To unbrick it each time, I did a restore with stock ROM H811V20p_00_0913.kdz with LGUP. That got it working again with stock ROM, but no root. There must be a way to get superSU to install on 20p (and even get the twrp recovery to flash). I unlocked the bootloader, and it seems to load, so apparently that's not the issue. Thanks.
Click to expand...
Click to collapse
have twrp .img in sd card and install click on image tab.. then select recovery and flash it.
once it flashes i just flash superSU and get root.
raptorddd said:
have twrp .img in sd card and install click on image tab.. then select recovery and flash it.
once it flashes i just flash superSU and get root.
Click to expand...
Click to collapse
Thanks raptorddd, but that's exactly the problem. I did flash superSU using twrp, and it seemed to install fine. I expected that I would simply get root as you say, but that's not what happened. The first time with SuperSU v1.94 newly installed, the phone rebooted normally, and the superSU app showed up, but it didn't work because it said there was no binary installed. The newer versions of superSU simply soft-bricked the phone. So I need a way to get superSU to work and not soft-brick the phone. Is there a preferred version of superSU for LG-H811 ROM 20p, or some obscure setting that makes it work?
theprof7 said:
Thanks raptorddd, but that's exactly the problem. I did flash superSU using twrp, and it seemed to install fine. I expected that I would simply get root as you say, but that's not what happened. The first time with SuperSU v1.94 newly installed, the phone rebooted normally, and the superSU app showed up, but it didn't work because it said there was no binary installed. The newer versions of superSU simply soft-bricked the phone. So I need a way to get superSU to work and not soft-brick the phone. Is there a preferred version of superSU for LG-H811 ROM 20p, or some obscure setting that makes it work?
Click to expand...
Click to collapse
did you open the app and clicked on update binaries.? if it asks to.?
here mine try this. then update from PS.
https://drive.google.com/file/d/0B90RfjoH13UEbDFBSG5XWVA0ME0/view?usp=sharing
raptorddd said:
did you open the app and clicked on update binaries.? if it asks to.?
here mine try this. then update from PS.
Thanks -- that's the the exact same version of superSU I used earlier (I even ran a diff, and the files are identical). After I flashed this version of superSU on the p20 stock ROM with twrp, it soft-bricked my phone. By that I mean it got to the boot page, and the blue LED pulsed on and off every few seconds, and it never got beyond that. When I flashed superSU v1.94, at least it booted afterward, but when I opened the superSU app, it didn't even give me the option to update binaries -- it just said the binary isn't installed, and so superSU can't run, it exited.
Maybe I'll try flashing an earlier stock ROM and see if that allows superSU to flash and run properly -- not sure which ones are compatible given the anti-rollback versioning.
Click to expand...
Click to collapse
theprof7 said:
raptorddd said:
did you open the app and clicked on update binaries.? if it asks to.?
here mine try this. then update from PS.
Thanks -- that's the the exact same version of superSU I used earlier (I even ran a diff, and the files are identical). After I flashed this version of superSU on the p20 stock ROM with twrp, it soft-bricked my phone. By that I mean it got to the boot page, and the blue LED pulsed on and off every few seconds, and it never got beyond that. When I flashed superSU v1.94, at least it booted afterward, but when I opened the superSU app, it didn't even give me the option to update binaries -- it just said the binary isn't installed, and so superSU can't run, it exited.
Maybe I'll try flashing an earlier stock ROM and see if that allows superSU to flash and run properly -- not sure which ones are compatible given the anti-rollback versioning.
Click to expand...
Click to collapse
try a custom kernel it has superSU installed.. i say imperium kernel.
try first the custom kernel.. if not you can only downgrade to 20o. no lower or youll hard brick phone.
Click to expand...
Click to collapse
OK so I finally got root. The key was to copy over this file to the phone's internal memory:
Imperium_Kernel_G4_H811_v4.8a.zip
Then:
adb reboot bootloader
fastboot boot twrp-3.0.2-0-h811.img
Then in TWRP, flash the imperium kernel. After that everything worked with root, though I still can’t get the twrp recovery to flash properly. Having root is good enough for now though.
EDIT: just now got TWRP to flash using flashify, so everything works. On to unlocking...
can you please share what guide you used to unlock and root this phone? I'm having issues on finding it, im on the newest update
theprof7 said:
OK so I finally got root. The key was to copy over this file to the phone's internal memory:
Imperium_Kernel_G4_H811_v4.8a.zip
Then:
adb reboot bootloader
fastboot boot twrp-3.0.2-0-h811.img
Then in TWRP, flash the imperium kernel. After that everything worked with root, though I still can’t get the twrp recovery to flash properly. Having root is good enough for now though.
EDIT: just now got TWRP to flash using flashify, so everything works. On to unlocking...
Click to expand...
Click to collapse
Please, can you share what guide you used to unlock and root this phone (20p)? Can not find any complex info anywhere.
Thank you.
theprof7 said:
OK so I finally got root. The key was to copy over this file to the phone's internal memory:
Imperium_Kernel_G4_H811_v4.8a.zip
Then:
adb reboot bootloader
fastboot boot twrp-3.0.2-0-h811.img
Then in TWRP, flash the imperium kernel. After that everything worked with root, though I still can’t get the twrp recovery to flash properly. Having root is good enough for now though.
EDIT: just now got TWRP to flash using flashify, so everything works. On to unlocking...
Click to expand...
Click to collapse
May I ask where you downloaded the Imperium_Kernel_G4_H811_v4.8a.zip
Did "fastboot boot twrp-3.0.2-0-h811.img" work?
What version of SuperSu did you install? I am planning on using "SR1-SuperSU-v2.78-SR1-20160915123031.zip"
king200 said:
May I ask where you downloaded the Imperium_Kernel_G4_H811_v4.8a.zip
Did "fastboot boot twrp-3.0.2-0-h811.img" work?
What version of SuperSu did you install? I am planning on using "SR1-SuperSU-v2.78-SR1-20160915123031.zip"
Click to expand...
Click to collapse
You can get the latest Imperium kernel (5.0 currently) from: http://forum.xda-developers.com/g4/orig-development/kernel-imperium-kernel-g4-v1-0-t3282915
Yes, fastboot boot from the twrp image was kind of a hack, but it worked. As for SuperSU, I tried v1.94 and SuperSU-v2.76-20160630161323.zip. Both soft-bricked the phone. Maybe the newest SuperSU will work, but I wouldn't count on it given that several previous versions didn't.
theprof7 said:
OK so I finally got root. The key was to copy over this file to the phone's internal memory:
Imperium_Kernel_G4_H811_v4.8a.zip
Then:
adb reboot bootloader
fastboot boot twrp-3.0.2-0-h811.img
Then in TWRP, flash the imperium kernel. After that everything worked with root, though I still can’t get the twrp recovery to flash properly. Having root is good enough for now though.
EDIT: just now got TWRP to flash using flashify, so everything works. On to unlocking...
Click to expand...
Click to collapse
I need to flash twrp and root from 20p also. One question to clarify exactly what you did,
Did you originally try flashing TWRP from TWRP? You said you flashed root from TWRP but I want to verify if you tried flashing TWRP from TWRP like:
> adb reboot bootloader
> fastboot boot twrp-3.0.2-0-h811.img
then in TWRP:
> install click on image tab.. then select twrp-3.0.2-0-h811.img recovery and flash it.
> reboot recovery (should reboot to TWRP you just flashed)
Just to be totally clear doing > fastboot boot twrp-3.0.2-0-h811.img leaves your stock recovery intact and just loads TWRP temporarily.
Or did you actually flash TWRP from TWRP and it didn't flash properly?
Thanks!
emailej said:
Just to be totally clear doing > fastboot boot twrp-3.0.2-0-h811.img leaves your stock recovery intact and just loads TWRP temporarily.
Or did you actually flash TWRP from TWRP and it didn't flash properly?
Thanks!
Click to expand...
Click to collapse
Yes, just loads TWRP temporarily. Later I installed some apps that flashed the recovery successfully, either rashr or flashify (I don't remember which)
I hope you have all the files and pc is reading your phone in adb.
Keep the downloaded twrp file in your adb folder with dwonloaded name (Ex:1234twrp.img)
Copy the file and keep in phone internal storage with names recovery.img
adb reboot bootloader (wait for phone to boot in bootloader ofcourse)
fastboot boot 1234twrp.img (whatever your twrp img file name would be)
Now you are in twrp recovery page in the phone.
Tap Install > Images (bottom right) > select recovery.img >
Now you are in next screen where options to slect recovery or boot
Tap recovery and swipe you will see [image flash complete]
Now twrp is permeant. You can restart in recovery without PC. (Tested)
I have flashed more than 6 methods to install supersu. Keep trying and reply.
Hello,
I am new to this forum, but have done a bit of unlocking and installing custom roms on other phones (mostly OPO's, both my old one and friends). But this new OP 3T I just got is giving me some troubles I have not encountered before. I would LOVE to put this into the correct forum, but of course with my being new to this forum...rules...
I am following the standard install over on the TWRP site and on the OP3T, the install finishes and then I reboot and I get a screen that says:
"Your device has been unlocked and can't be trusted. If you don't want to see this screen, please lock your device by "fastboot oem lock" an erase userdata..."
I have never seen this before. Can someone give me a idea what could be going on here? Do I need to re-lock it? What did OP do to their phones!!?!
Oh and also, I am planning on installing LineageOS. Any reason I shouldn't?
Thanks!
Blenderite said:
Hello,
I am new to this forum, but have done a bit of unlocking and installing custom roms on other phones (mostly OPO's, both my old one and friends). But this new OP 3T I just got is giving me some troubles I have not encountered before. I would LOVE to put this into the correct forum, but of course with my being new to this forum...rules...
I am following the standard install over on the TWRP site and on the OP3T, the install finishes and then I reboot and I get a screen that says:
"Your device has been unlocked and can't be trusted. If you don't want to see this screen, please lock your device by "fastboot oem lock" an erase userdata..."
I have never seen this before. Can someone give me a idea what could be going on here? Do I need to re-lock it? What did OP do to their phones!!?!
Oh and also, I am planning on installing LineageOS. Any reason I shouldn't?
Thanks!
Click to expand...
Click to collapse
Is nothing wrong with your device ..What you get is a warning that your bootloader is unlocked ...
You gonna get this every time you want to boot to your ROM or to twrp....
You can proceed further to install any ROM that you like...
I think you can find a guide on XDA forums to disable this warning if you want...
cultofluna said:
Is nothing wrong with your device ..What you get is a warning that your bootloader is unlocked ...
You gonna get this every time you want to boot to your ROM or to twrp....
You can proceed further to install any ROM that you like...
I think you can find a guide on XDA forums to disable this warning if you want...
Click to expand...
Click to collapse
Ok I tried that and a new problem came up!! When I try to reboot into recovery, I do not get TWRP, but the stock recovery that was there originally! Unless they have completely changed the look of TWRP. I will try to upload a picture of it if that helps.
You can't get rid of the bootloader-unlocked warning without re-locking your bootloader, which you really should not do while you have a custom recovery installed.
Are you sure you've flashed TWRP and not just booted it it from a local file on your computer? Try using fastboot to wipe recovery first before flashing TWRP.
Anova's Origin said:
You can't get rid of the bootloader-unlocked warning without re-locking your bootloader, which you really should not do while you have a custom recovery installed.
Are you sure you've flashed TWRP and not just booted it it from a local file on your computer? Try using fastboot to wipe recovery first before flashing TWRP.
Click to expand...
Click to collapse
I followed the Fastboot method on this page (rules won't let me post the link normally): twrp. me/devices/oneplus3t.html
Blenderite said:
I followed the Fastboot method on this page (rules won't let me post the link normally): twrp. me/devices/oneplus3t.html
Click to expand...
Click to collapse
Right on that page (last paragraph of fastboot install method), you will see:
Note many devices will replace your custom recovery automatically during first boot. To prevent this, use Google to find the proper key combo to enter recovery. After typing fastboot reboot, hold the key combo and boot to TWRP. Once TWRP is booted, TWRP will patch the stock ROM to prevent the stock ROM from replacing TWRP. If you don't follow this step, you will have to repeat the install.
I had a heck of a time with this myself (even reading the above). Even rebooting (after flash TWRP) to recovery (power+vol down), the TWRP install would still not "stick". Had to try multiple times. I also rooted with SuperSU 2.79 at some point in that process, which may or may not have helped TWRP to finally "stick".
redpoint73 said:
Right on that page (last paragraph of fastboot install method), you will see:
Note many devices will replace your custom recovery automatically during first boot. To prevent this, use Google to find the proper key combo to enter recovery. After typing fastboot reboot, hold the key combo and boot to TWRP. Once TWRP is booted, TWRP will patch the stock ROM to prevent the stock ROM from replacing TWRP. If you don't follow this step, you will have to repeat the install.
I had a heck of a time with this myself (even reading the above). Even rebooting (after flash TWRP) to recovery (power+vol down), the TWRP install would still not "stick". Had to try multiple times. I also rooted with SuperSU 2.79 at some point in that process, which may or may not have helped TWRP to finally "stick".
Click to expand...
Click to collapse
I tried this once before, but after your suggestion to try it several times, it finally worked! Thanks!!
Flash TWRP, reboot, press the volume down key before the phone boots, go into recovery, you should see TWRP flash screen, that usually works but I'm glad you got it going