Develop Bugs

[Q] Where can I get CM11 howto on Ouya

Hello
I own Ouya for the month but most of time I use it as media-box for TV (watching movies, etc)
I have already rooted it and installed play market but i hate the stock UI and obsolate android
I saw a video in youtube with CM11 and ouya (android 4.4) and started to google the solution
I already know that it is based on Eternity Project kernel.
I found the way to install bootloader http://www.eternityproject.eu/topic/1114365-eternityproject-tpl-bootloader-for-ouya/ and it is clear
The next step is to install kernel http://www.eternityproject.eu/topic/1114362-eternityproject-kernel-3437-for-ouya-cpu-2ghz-gpu-650mhz/ but it is unclear for me about fastboot command
The next step as I understand is to install CM11 from the CWM
Is it possible to install KitKat without EP kernel?
So If someone have detailed steps or howto on installing CM11 on ouya please give it to this thread
Thanks in advance

I think this is what you're looking for. I'm not sure the EP boot loader is compatible but I'm sure its mentioned in the thread somewhere. Or in the bootmenu thread anyway.
http://forum.xda-developers.com/showthread.php?p=51332165
Sent from my Nexus 5 using XDA Premium 4 mobile app

This is the order you need to go:
Upgrade to newest clockwork mod from milaq in your recovery.
Then install the failsafe bootloader.
Then install cm11 from the new recovery, along with gapps he posted in the same thread Make sure to wipe all the stock stuff.
Thats it.

quepaso said:
This is the order you need to go:
Upgrade to newest clockwork mod from milaq in your recovery.
Then install the failsafe bootloader.
Then install cm11 from the new recovery, along with gapps he posted in the same thread Make sure to wipe all the stock stuff.
Thats it.
Click to expand...
Click to collapse
Can you put that in a bit more laymans desperate for a guide,you say wipe all stuff,do i backup my ouya in recovery first do i erase every thing and how please?
Sorry to be a pain [email protected] it up once and had to unbrick already spent 48hrs repairing my ouya and put a guide up on how on here,because nobody puts it laymans online for this.I downloaded all files ready to download folder mate.

PHYSC-1 said:
Can you put that in a bit more laymans desperate for a guide,you say wipe all stuff,do i backup my ouya in recovery first do i erase every thing and how please?
Sorry to be a pain [email protected] it up once and had to unbrick already spent 48hrs repairing my ouya and put a guide up on how on here,because nobody puts it laymans online for this.I downloaded all files ready to download folder mate.
Click to expand...
Click to collapse
Its hard to lay it out, you need to go to the threads where the info is already layed out.
Do you already have a custom recovery installed like clockwork? Great, then go to the failsafe thread to get a newer version of the recovery, and the failsafe installer. If you do not, you need to go to the custom recovery threads as there are multiple, and get any type of custom recovery installed. Then from there, install the newer custom recovery from the failsafe thread, then the failsafe itself from within the new custom recovery, then from there you can install cm11 using the cm11 thread following the instructions.

quepaso said:
Its hard to lay it out, you need to go to the threads where the info is already layed out.
Do you already have a custom recovery installed like clockwork? Great, then go to the failsafe thread to get a newer version of the recovery, and the failsafe installer. If you do not, you need to go to the custom recovery threads as there are multiple, and get any type of custom recovery installed. Then from there, install the newer custom recovery from the failsafe thread, then the failsafe itself from within the new custom recovery, then from there you can install cm11 using the cm11 thread following the instructions.
Click to expand...
Click to collapse
Just realized cwm is removed,can't install using oneclickrecovery tool either fails says cannot find img etcetc,yet its all there no problems adb is fine and works.Fastboot driver i can't get running although listed yellow exclamation,any ideas?
Fixed it managed to get fastboot going downloaded the required missing dll files and win_usb.inf set up and used ouyatoolbox 1.0.0.0 to rewrite recovery,found i can no longer add the newer 6.0.4.8 recovery zip in update from zip in 6.0.3.2 recovery though? Used to be able to do that. Any way tmore to the point is can someone tell me the step by step process to add cm11 firmware so i don't have to read a load of [email protected] that doesn't end up giving less than nothing in terms of having a clue how,someone in the thread writes about erasing stuff and what oreder but that doesn't tell you how to install or what erase process is or anything detailed and the net has exactly the same misguided tutorials on how to do it.Tellinng a newbie to erase stuff means they will erase all the wrong stuff in all fairness it's good to have a slightly better idea by reading that but it doesn't go in depth or step by step.
All i have found is sites pointing back to the xda pages that do not explain it,it's like your expected to know everything before you have been taught and fill in the gaps off the top of your head.

quepaso said:
This is the order you need to go:
Upgrade to newest clockwork mod from milaq in your recovery.
Then install the failsafe bootloader.
Then install cm11 from the new recovery, along with gapps he posted in the same thread Make sure to wipe all the stock stuff.
Thats it.
Click to expand...
Click to collapse
Exactly what he said, I just did these same steps on a 3rd new ouya yesterday and it went off without a hitch. The cm11 thread is long but honestly all the information you need is in the first few posts. If you were able to connect the ouya to USB and run oneclickroot then you're ready to get started.

HTC One M8 How to backup stock image

Hey All,
Model: HTC One M8 - 0p6b160
CID: TELUS0001
Got a HTC One M8 the other day, I have already dev unlocked it via HTC, but I'm looking to have root and if possible s-off but stay on the stock image.
I've been wanting to backup the recovery image (since there seems to be very little resources for the TELUS001 CID) but from everything I've read this can only be done once you have root using adb and dd. To get root I need to install TWRP or PHILZ.
What I'm not clear about:
Are TWRP or PHILZ replacing the recovery image? Is there actually a way to backup recovery image? or did I miss something.
When TWRP/PHILZ do a backup is it just the current installed state of the phone?
Reading a post on another forum (can't post link cause I'm new) they talk about doing a temporary flash, but I didn't seem to be able to make that work using: fastboot boot twrp-m8-recovery.img
In the future I want to go to Android L, will any of this prevent it?
Thanks

felix2000 said:
Are TWRP or PHILZ replacing the recovery image? Is there actually a way to backup recovery image? or did I miss something.
When TWRP/PHILZ do a backup is it just the current installed state of the phone?
Reading a post on another forum (can't post link cause I'm new) they talk about doing a temporary flash, but I didn't seem to be able to make that work using: fastboot boot twrp-m8-recovery.img
In the future I want to go to Android L, will any of this prevent it?
Click to expand...
Click to collapse
1 and 3. You can backup stock recovery by booting into custom recovery that is located on your computer, instead of flashing custom recovery to the phone. This is already what you have described in Item 3. Is your phone in fastboot mode? The TWRP file is located in the same folder as fastboot.exe? Are you sure you have fastboot connectivity? To check this, type "fastboot devices" (with no quotes) and see if your device ID comes up.
Also, a great many stock recoveries are already posted here: http://forum.xda-developers.com/showthread.php?t=2701376
This thread also describes the process of backing up stock recovery via fastboot.
2. Not sure what you are asking. But yes, recovery can't backup something that isn't there (just current installed state).
4. Having custom recovery will prevent install of OTA, if that is what you mean. But return to stock recovery and restore any system files altered by root allows install of OTA. Or you can just install a custom ROM based on Android L when it comes out, as custom ROMs are sure to come quickly after L is available. Maybe even sooner than your version's OTA.

Root with Stock Recovery?

Hi folk,
Ok, it may seem a silly question, but I did search in previous posts, and and didn't find out an answer.
Now easly: can I root with the custom recovery loaded on the fly (fastboot boot TWRP.img), that's not flashing it into the recovery partition?
Does it keep the root on, and together the chance to OTA?
Or do I need to flash the custom Recovery in any case?
In this case, how can I make a "my_recovery.img" dump from my original?
I tried loading on-the-fly the TWRP, and selecting backup, but I got a lot of files ....
Thanks, sorry if these questions were already asked, but I didn't find any answer...

How do I backup my stock recovery?

I want to be able to flash my stock recovery when I no longer want TWRP or CWM. How would I go about doing this?

tcmoffitt said:
I want to be able to flash my stock recovery when I no longer want TWRP or CWM. How would I go about doing this?
Click to expand...
Click to collapse
Hello,
Thanks for using XDA Assist.
What device do you have?
___
v7
XDA Assist

v7 said:
Hello,
Thanks for using XDA Assist.
What device do you have?
___
v7
XDA Assist
Click to expand...
Click to collapse
HTC One m8 Tmobile

Thanks for the help guys I really appreciate it. This forum is just so helpful............. ---____---

Which T-Mobile ?
If it is T-Mob US .. there's a dedicated section for T-Mob US and you can find any info there.

tcmoffitt said:
Thanks for the help guys I really appreciate it. This forum is just so helpful............. ---____---
Click to expand...
Click to collapse
This is not possible to backup your stock recovery. When you need that you can download it simply (base on your phone's build number). Also you can extract stock recovery frome your ota zip update(the file with img format inside of firmware folder)

Arsinn said:
This is not possible to backup your stock recovery.
Click to expand...
Click to collapse
Actually, the following usually works:
This has to be done before flashing custom recovery. Unlock bootloader, then fastboot boot recovery.img
With "recovery.img" being a TWRP file located in your fasboot folder. This will boot into TWRP without actually flashing it. From there, you can pick recovery in the backup options, to backup stock recovery.
But yes, I agree that stock recovery images are pretty easy to obtain from these forums, or extracting from a OTA or ROM.zip.

redpoint73 said:
Actually, the following usually works:
This has to be done before flashing custom recovery. Unlock bootloader, then fastboot boot recovery.img
With "recovery.img" being a TWRP file located in your fasboot folder. This will boot into TWRP without actually flashing it. From there, you can pick recovery in the backup options, to backup stock recovery.
But yes, I agree that stock recovery images are pretty easy to obtain from these forums, or extracting from a OTA or ROM.zip.
Click to expand...
Click to collapse
Hi, redpoint73...
Maybe I'm missing something here, but I'm not seeing an option to backup the Recovery in TWRP 2.8.7.0... Just Boot, Cache, System, Data and Android Secure are available (see attached screenshot). I remote booted TWRP from my laptop, as I did when I rooted Marshmallow around a fortnight ago, in order to keep the stock recovery intact.
It would certainly be useful to be able to backup the stock recovery via TWRP... I just haven't found a way of accomplishing it .
-----
But a possible option to backup the stock recovery would be to use the Flashify app...
Remote boot TWRP from your PC, acquire root, and then run Flashify...
Flashify PlayStore link...
https://play.google.com/store/apps/details?id=com.cgollner.flashify
XDA discussion thread...
http://forum.xda-developers.com/showthread.php?t=2349847
This app uses <dd=if/of> commands to backup and potentially restore the boot and/or recovery images.
Although it does require root to work.
I've used Flashify on my Nexus 7 and Nexus 9 in the past, but never on my M8, except to backup... never to restore, so I cannot personally vouch for it's safety on the M8.
-----
What I'm unsure of about Flashify...
@redpoint73, @ckpv5, maybe you guys could shed some light on this...
Would such a <dd=if/of> created backup of stock recovery be flashable via fastboot?
And would it be safe to do so?
I know that TWRP uses <dd=if/of> commands, having looked through TWRPs logs... but I'm not quite sure how fastboot works when it comes to flashing stuff, and I'm very wary about doing it myself or recommending it for others.
Normally, you'd just use the Flashify app to restore any recovery/boot.img backups you've previously made...
But Flashify requires root to work, and with an unrooted system, this is isn't viable. So could one use fastboot in the normal way to flash such a previously made backup of the stock recovery?
-----
Anyhow, it's not critical at the moment for me, because I've not flashed TWRP to my M8, my stock recovery remains intact.
-----
I would recommend anybody reading this seeking to root their Marshmallow M8 to just remote boot TWRP from their PC with fastboot boot twrp.img (ie., don't actually flash it), perform an unrooted Nandroid backup first...
...and then flash Chainfire in the usual way.
This leaves the stock recovery intact, which will be required for future OTAs.
And there still might be some...
My Nexus 9 receives monthly security patches from Google (probably after the StageFright debacle of last year), and it may well be that the M8 will also continue to receive security patches, despite it being nearly two years old.
So you need to be ready... with an unrooted/untouched Nandroid of your own creation and the stock recovery.
I know that Chainfires systemless root method is supposed to address this issue, but if you're going to mess with system, you should have a Nandroid backup anyway...
...just in case.
Rgrds,
Ged.

Funny, I use the fastboot boot option to boot into TWRP saving my original recovery.

NEED HELP

I have a brand new Pixel XL from Verizon that I received today and was successful in unlocking. However, I tried to root and now I am stuck on bootloop. I cannot post in DEVELOPMENT because I haven't posted here in years (haven't had ANDROID in a while). Can anyone help? I am able to access via fastboot (I believe) but I must be flashing the wrong images. I don't want to brick this nice new day-old device. I have been at it for 5 hours via research on my own, but now I am looking for someone that can help me via P.M. or what it may take. I really want to get back to enjoying this device! Thanks in advance!

bdsuser said:
I have a brand new Pixel XL from Verizon that I received today and was successful in unlocking. However, I tried to root and now I am stuck on bootloop. I cannot post in DEVELOPMENT because I haven't posted here in years (haven't had ANDROID in a while). Can anyone help? I am able to access via fastboot (I believe) but I must be flashing the wrong images. I don't want to brick this nice new day-old device. I have been at it for 5 hours via research on my own, but now I am looking for someone that can help me via P.M. or what it may take. I really want to get back to enjoying this device! Thanks in advance!
Click to expand...
Click to collapse
Read the third post in the thread below to get set up and back to stock. Then we will work on root. If you tried to root and you bootlooped it then you used the wrong​ SU.
https://forum.xda-developers.com/pixel/help/stupidly-bootloop-help-t3554242

1. Download a ROM. A stock version is probably in the forums somewhere if that's what you want.
2. Download TWRP image and zip from the TWRP thread.
3. Download SuperSU from the SuperSU thread.
4. Download a vendor image. There's no "official" vendor image thread AFAIK, but you can grab one from the Pure Nexus rom thread. NMF26V is compatible with all 7.1.1 ROMs & stock.
Now you have two options:
Fast: Put the ROM, TWRP(zip only), SuperSU and vendor image on USB flash drive, then connect the USB 3 to USB C adapter to your flash drive. Don't connect it to the phone yet. An external HDD/SSD should also work if that's all you've got.
Slow: While in TWRP(Instructions below) push the ROM, TWRP(zip only), SuperSU and vendor image files to your phone through ADB with "adb push C:\file_path\ /sdcard/" sans quotes. You will need to do this for each file, or alternatively push a folder containing the four files. adb file transfer is very slow.
5. Boot your phone to the bootloader, and connect it to your computer. This can be achieved by holding volume down and power from an off state.
Note: If your device is still bootlooping you won't be able to get to the bootloader. Hold volume up and power until the device shuts off to get out of the bootloop temporarily, then boot to bootloader.
6. In a command window, "fastboot boot twrp.img"
7. Connect your flash drive to your phone if you chose that option, or push the files through adb if you chose that option
8. Flash TWRP zip, ROM and vendor image. STAY IN TWRP
9. Return to TWRP's home screen > advanced > file manager. Scroll down until you see 'fstab.marlin'(in the root '/' directory). Tap on 'fstab.marlin' and delete it. Skipping this step means SuperSU won't install.
10. Flash SuperSU zip, reboot to system and you're done.

SDK
TonikJDK said:
Read the third post in the thread below to get set up and back to stock. Then we will work on root. If you tried to root and you bootlooped it then you used the wrong​ SU.
https://forum.xda-developers.com/pixel/help/stupidly-bootloop-help-t3554242
Click to expand...
Click to collapse
Just thought I'd update you...And I know I sound like I have no idea what I'm doing but traditionally I've never had issues like this But I am trying to get ADB to show the flash-all command. The one I have installed doesn't show that feature so I can't follow the tutorial. If you have a direct link to what I may be missing I would appreciate it otherwise I will update you once I figure it out.

bdsuser said:
Just thought I'd update you...And I know I sound like I have no idea what I'm doing but traditionally I've never had issues like this But I am trying to get ADB to show the flash-all command. The one I have installed doesn't show that feature so I can't follow the tutorial. If you have a direct link to what I may be missing I would appreciate it otherwise I will update you once I figure it out.
Click to expand...
Click to collapse
The link to the proper adb and fastboot are in the post i pointed you to.

Help with root and TWRP
TonikJDK said:
The link to the proper adb and fastboot are in the post i pointed you to.
Click to expand...
Click to collapse
Thanks for your assistance. I now have root installed and I think I'm good except for one thing. I keep thinking TWRP is installed but for some reason when I reboot to bootloader, then select reboot recovery mode, it takes me to android recovery. I am used to recovery taking me to TWRP. I know TWRP works but I feel like I'm temporarily flashing it each time or something. I even installed the twrp app and I see I can flash zips that way, etc, but I wanted to know if you knew how to make the phone boot to TWRP in recovery? Or is that necessary?

bdsuser said:
Thanks for your assistance. I now have root installed and I think I'm good except for one thing. I keep thinking TWRP is installed but for some reason when I reboot to bootloader, then select reboot recovery mode, it takes me to android recovery. I am used to recovery taking me to TWRP. I know TWRP works but I feel like I'm temporarily flashing it each time or something. I even installed the twrp app and I see I can flash zips that way, etc, but I wanted to know if you knew how to make the phone boot to TWRP in recovery? Or is that necessary?
Click to expand...
Click to collapse
I dont do it that way on this phone. TWRP and SU are modifying the same parts of the phone, and there are cases where it could conflict. Rare, not a big deal, but since i don't need TWRP installed i don't.
To install it ypu first boot to it.
Fastboot boot twrpFilename.
Then from within TWRP you install the TWRP zip.
Make sure it is TWRP RC1

All set
Thanks again for your help. I am running pure ROM as I mentioned and I seem to like it. Do you K or if Franco works with Pure or do you have a suggestion on a good rom/kernel? Is there anything else that you can suggest I should be using with the new phone? I remember there used to be tools that you could install that allowed you to customize the system even further but the name escapes me. . Is there anything like that or even a theme tool which is a must have when you are rooted and running custom roms? No big deal if not. Very happy with where I stand now. Really appreciate you getting me back up and running!

You are most welcome. I don't ROM so I don't know what kernels work with what roms for sure. But my understanding is that they are all pretty universal. I run stock with Franco.
Other than that i dont mod much. Ad blocker, black themes and a few adjustments to Franco.

TonikJDK said:
You are most welcome. I don't ROM so I don't know what kernels work with what roms for sure. But my understanding is that they are all pretty universal. I run stock with Franco.
Other than that i dont mod much. Ad blocker, black themes and a few adjustments to Franco.
Click to expand...
Click to collapse
Perfect! Thanks yet again. Have a great remainder of the day!

bdsuser said:
Thanks again for your help. I am running pure ROM as I mentioned and I seem to like it. Do you K or if Franco works with Pure or do you have a suggestion on a good rom/kernel? Is there anything else that you can suggest I should be using with the new phone? I remember there used to be tools that you could install that allowed you to customize the system even further but the name escapes me. . Is there anything like that or even a theme tool which is a must have when you are rooted and running custom roms? No big deal if not. Very happy with where I stand now. Really appreciate you getting me back up and running!
Click to expand...
Click to collapse
Im running pure and elementalx with excellent results.
?Tapped from my pure pixelXl?

have you ever seen an issue where the phone boots to twrp even though everything was working fine? It starts happening if I do a restart. Then no matter what it boots into TWRP unless I wipe again? I believe it's happening after I flash root but I'm going out of my mind with trial and error. Any help would be appreciated.

bdsuser said:
have you ever seen an issue where the phone boots to twrp even though everything was working fine? It starts happening if I do a restart. Then no matter what it boots into TWRP unless I wipe again? I believe it's happening after I flash root but I'm going out of my mind with trial and error. Any help would be appreciated.
Click to expand...
Click to collapse
HELLO!!! I understand any frustrations you may be having, as the pixel devices have changed a good bit for us as far as development. Anyways. I'm just going to throw some knowledge out there, then proceed to help get you up and running!
You couldn't post in the development section because of your post count, but even if you could, it would have been in the wrong section and it would have been removed, or moved to the questions section.
Also, I see someone has pointed it out earlier, but I'll say it again just to make sure everything is clear. The command you were running "fastboot boot TWRP.img" only boots TWRP temporarily. You are suppose to have two files, one IMG file and one zip file. You boot the IMG file, then once you're in TWRP, you flash the zip file, then reboot to recovery and you will have installed TWRP properly.
With root, flashing wrong files or using the outdated root method will cause boot loops. The correct way to root (again already been said) is the get TWRP up and running, delete the fstab file (see earlier post) then flash SuperSU and reboot. Just throwing this out there Incase someone comes across it, if you manage to boot loop your device due to to rooting, you can fastboot flash franco's kernel and it will fix the bootloop (,but you won't have root) this isn't the correct way to fix it, but it will get you back up and running without downloading the large factory image.
***About to edit this post to continue giving more info***
Here is a correct guide and good template to get you running.
start by flashing a clean factory image, then let it boot and get it set up.
Reboot to fastboot, fastboot boot TWRP IMG then flash TWRP zip using the latest versions (RC1 is latest, pm me for more info).
Reboot the phone to recovery to ensure TWRP stuck.
Go-to advanced, file manager in TWRP and find the fstab.marlin file and delete.
Then you can go ahead and flash the latest SuperSU (I use 2.79 sr3) and when it's done reboot to system and verify root.
After rooting you can go ahead and flash a kernel if you want, I use elemental which you can flash in TWRP, but see the kernel instructions prior to flashing.
Reboot and you have a nice stock ROM with root and kernel.
For flashing Roms, kind of follow the same template, most Roms require you to flash part of or the whole latest factory image.
If your on a clean install, go ahead and install TWRP as mentioned above.
Then use TWRP to install whatever ROM you want per ROM developer instructions.
Side note, some Roms replace the TWRP with cwm or stock recovery, so it's always nice to flash the TWRP zip after flashing a ROM.
After flashing ROM, boot to system to make sure all is well, then boot back to recovery and follow instructions above for root/kernel.
As far as the problem you're having now, it usually comes from flashing outdated SuperSU images. Do a search for 2.79 sr3 and use it to root (pm me if you need help)
You might have to start clean one more time, And flash factory image.

noidea24 said:
HELLO!!! I understand any frustrations you may be having, as the pixel devices have changed a good bit for us as far as development. Anyways. I'm just going to throw some knowledge out there, then proceed to help get you up and running!
You couldn't post in the development section because of your post count, but even if you could, it would have been in the wrong section and it would have been removed, or moved to the questions section.
Also, I see someone has pointed it out earlier, but I'll say it again just to make sure everything is clear. The command you were running "fastboot boot TWRP.img" only boots TWRP temporarily. You are suppose to have two files, one IMG file and one zip file. You boot the IMG file, then once you're in TWRP, you flash the zip file, then reboot to recovery and you will have installed TWRP properly.
With root, flashing wrong files or using the outdated root method will cause boot loops. The correct way to root (again already been said) is the get TWRP up and running, delete the fstab file (see earlier post) then flash SuperSU and reboot. Just throwing this out there Incase someone comes across it, if you manage to boot loop your device due to to rooting, you can fastboot flash franco's kernel and it will fix the bootloop (,but you won't have root) this isn't the correct way to fix it, but it will get you back up and running without downloading the large factory image.
***About to edit this post to continue giving more info***
Here is a correct guide and good template to get you running.
start by flashing a clean factory image, then let it boot and get it set up.
Reboot to fastboot, fastboot boot TWRP IMG then flash TWRP zip using the latest versions (RC1 is latest, pm me for more info).
Reboot the phone to recovery to ensure TWRP stuck.
Go-to advanced, file manager in TWRP and find the fstab.marlin file and delete.
Then you can go ahead and flash the latest SuperSU (I use 2.79 sr3) and when it's done reboot to system and verify root.
After rooting you can go ahead and flash a kernel if you want, I use elemental which you can flash in TWRP, but see the kernel instructions prior to flashing.
Reboot and you have a nice stock ROM with root and kernel.
For flashing Roms, kind of follow the same template, most Roms require you to flash part of or the whole latest factory image.
If your on a clean install, go ahead and install TWRP as mentioned above.
Then use TWRP to install whatever ROM you want per ROM developer instructions.
Side note, some Roms replace the TWRP with cwm or stock recovery, so it's always nice to flash the TWRP zip after flashing a ROM.
After flashing ROM, boot to system to make sure all is well, then boot back to recovery and follow instructions above for root/kernel.
As far as the problem you're having now, it usually comes from flashing outdated SuperSU images. Do a search for 2.79 sr3 and use it to root (pm me if you need help)
You might have to start clean one more time, And flash factory image.
Click to expand...
Click to collapse
There is absolutely no need to delete the fstab file anymore. That only needed to be done when TWRP was still alpha 2, and almost three versions of su earlier.
ALL roms replace TWRP with stock recovery unless you are using lineage then you will get Cyanogenmod recovery, so reflashing TWRP before booting into system is a must.
If you are flashing root and or custome kernel and end up in a bootloop, flashing the stock boot.img to both slots via:
'fastboot flash --slot _a boot boot.img'
'fastboot flash --slot _b boot boot.Img'
will fix the issue and you will be able to boot up just fine. Again you will have to reboot into TWRP from the bootloader and reflash the zip. When you are done flashing the boot.img's you might as well just
'Fastboot boot TWRP-file.img'
Then install the zip!