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TWRP and Magisk help please!

I've been away for about a year so I'm behind on everything right now. I just flashed a factory image to get back to Android 8.1 and set my phone up from scratch. I would like to install TWRP and Magisk but have some questions..
TWRP. Do I just find the latest TWRP for this phone and the process is the same as before? Fastboot flash twrp img and then install TWRP zip?
Magisk: I have never used it before so I'm not to familiar at all. From what I can tell I just download the zip and install via twrp? Is there a specific version I should be looking for for the Pixel on 8.1 or will the latest from the Magisk forum work?
I've searched around and keep seeing random issues so I'm wondering if it's as straight forward as mentioned above. I see posts about people trying to install TWRP and Magisk and bootlooping and stuff like that. Thanks!!

Hello look here for the latest Recovery. https://twrp.me/google/googlepixel.html
Flash the TWRP image over the PC.
fastboot boot recovery TWRP.img
Then Flash it via TWRP. (the zip file on your sdcard).
The device has an A and B Partition. It would Flash on both.
If you Flash an custom Rom you Flash it on A Partition you must Flash TWRP.zip again. Reboot the device. After an reboot to Recovery you on B Partition automatically. Here you can Flash Magisk and other zips like custom Kernel or other.
If you Flash the custom Rom on B Partition you must flash magisk and other stuff on A Partition.

With Magisk 18.0 stable, some people have bootloops when flashing TWRP.
Best thing to do is just boot TWRP img when needed instead of flash the zip, maybe this has been fixed with latest canary builds but it's better boot the image just to be sure

How to upgrade rooted/unlocked OOS 9 to latest without losing anything?

I am unlocked + rooted with Magisk. I want to stay that way.
Last time I upgraded from OOS 9.0.1 > 9.0.2 via UI, the upgrade wiped everything and I needed to start from scratch (as if I just got a new phone). Is there a way to make the upgrade seamless without losing everything? I want to upgrade to 9.0.3

https://forum.xda-developers.com/oneplus-6/how-to/official-oxygenos-5-1-5-ota-oneplus-6-t3794232
Post #3 has the instructions you need
Long story short you need to flash the update via TWRP.

unknown00 said:
I am unlocked + rooted with Magisk. I want to stay that way.
Last time I upgraded from OOS 9.0.1 > 9.0.2 via UI, the upgrade wiped everything and I needed to start from scratch (as if I just got a new phone). Is there a way to make the upgrade seamless without losing everything? I want to upgrade to 9.0.3
Click to expand...
Click to collapse
1. Download full ROM
2. Reboot to recovery
3. Flash full ROM
4. Flash TWRP
5. Reboot to recovery
6. Flash magisk
7. Reboot to system

tabletalker7 said:
1. Download full ROM
2. Reboot to recovery
3. Flash full ROM
4. Flash TWRP
5. Reboot to recovery
6. Flash magisk
7. Reboot to system
Click to expand...
Click to collapse
Just to confirm that this is how I have upgraded to 9.0.3 without problems days ago.
For 4. I have used blue spark twrp
Sent from my ONEPLUS A6003 using Tapatalk

RASTAVIPER said:
Just to confirm that this is how I have upgraded to 9.0.3 without problems days ago.
For 4. I have used blue spark twrp
Sent from my ONEPLUS A6003 using Tapatalk
Click to expand...
Click to collapse
tabletalker7 said:
1. Download full ROM
2. Reboot to recovery
3. Flash full ROM
4. Flash TWRP
5. Reboot to recovery
6. Flash magisk
7. Reboot to system
Click to expand...
Click to collapse
2 questions - why can't I do #6 after #3? Can I?
Also, do I need to do #4 since I have it already installed?

unknown00 said:
2 questions - why can't I do #6 after #3? Can I?
Also, do I need to do #4 since I have it already installed?
Click to expand...
Click to collapse
You can't do either thing you want to do there because of the added fun of the OnePlus 6 having A/B partitioning. With A/B partitioning there is no recovery partition, and recovery is now a part of boot. You need to flash TWRP again because the update will overwrite TWRP with stock recovery. And you have to wait til after the reboot to recovery to install magisk so it gets the partitioning right.

Like above.
Flashing ROM Will also flash stock recovery so after ROM you need to flash twrp again,if you reboot without it it's lost.
Also why magisk isn't flashed right away is because: when you choose to reboot to twrp after the twrp flash it Will change slot, this way you Will get magisk on the correct slot.
All this can be done from the OS.
Install the ROM upgrade as usual,don't reboot.
Open magisk app
Search for a module a/b twrp (you Will only find one module) and install it.ndont reboot just yet.
Go to main screen of magisk
Press install, install, install to inactive slot (after OTA). After this install you can reboot.
Both works, I find the twrp way to be more convenient

I don't about stable i am on open beta 10 i root every beta without twrp using patch boot image i got update every time around 1.5 GB because i am rooted after update i just lose root everything same before update phone not wipe anything

I upgraded vom 9.0.1 to 9.0.3 by
- Downloading the full 9.0.3
- Copy them to the sdcard root directory
- Update via settings / manual update - DO NOT REBOOT
- Reinstall Magisk into inactive slot with Magisk Manager
- Reboot
Works. But Magisk 18 MagiskHide does not work properly on my OP6, so I had to downgrade to Magisk 17.2.
- Download latest TWRP BluSpark .img, Magisk 18 uninstaller, Magisk 17.2
- Copy uninstaller and Magisk 17.2 to sdcard root
- Reboot into Fastboot
- Boot into TWRP by fastboot boot <name of TWRP BluSpark .img file)
- flash uninstaller
- flash Magisk 17.2
- Clear Dalvik cache
- Reboot and setup Magisk (settings in Magisk manager regarding Hide and root permissions were lost).
- Uninstall duplicate Magisk Manager 6.1.x (not compatible with Magisk 17.2).

akxak said:
I upgraded vom 9.0.1 to 9.0.3 by
- Downloading the full 9.0.3
- Copy them to the sdcard root directory
- Update via settings / manual update - DO NOT REBOOT
- Reinstall Magisk into inactive slot with Magisk Manager
- Reboot
Works. But Magisk 18 MagiskHide does not work properly on my OP6, so I had to downgrade to Magisk 17.2.
- Download latest TWRP BluSpark .img, Magisk 18 uninstaller, Magisk 17.2
- Copy uninstaller and Magisk 17.2 to sdcard root
- Reboot into Fastboot
- Boot into TWRP by fastboot boot <name of TWRP BluSpark .img file)
- flash uninstaller
- flash Magisk 17.2
- Clear Dalvik cache
- Reboot and setup Magisk (settings in Magisk manager regarding Hide and root permissions were lost).
- Uninstall duplicate Magisk Manager 6.1.x (not compatible with Magisk 17.2).
Click to expand...
Click to collapse
No need to reinstall TWRP in the first method?

unknown00 said:
No need to reinstall TWRP in the first method?
Click to expand...
Click to collapse
I do not have TWRP installed, it is basically not necessary as OOS can be updated with the settings/manual update tool and Magisk can be reinstalled via Magisk manager.
I had to use TWRP solely to downgrade to Magisk 17.2 from Magisk 18 as this cannot be done with Magisk Manager. But for that purpose, it's enough to temporarly make TWRP available via fastboot boot command without permanently installing it.
If you have TWRP and want to keep it, that easy process doesn't work to upgrade the OS.

unknown00 said:
No need to reinstall TWRP in the first method?
Click to expand...
Click to collapse
If you wanna keep TWRP you do the way I described few posts up.....

tabletalker7 said:
You can't do either thing you want to do there because of the added fun of the OnePlus 6 having A/B partitioning. With A/B partitioning there is no recovery partition, and recovery is now a part of boot. You need to flash TWRP again because the update will overwrite TWRP with stock recovery. And you have to wait til after the reboot to recovery to install magisk so it gets the partitioning right.
Click to expand...
Click to collapse
So magisk installs to the opposite partition you're currently booting from? Only reason I ask is because previously, I missed the second reboot before installing magisk and the phone wouldn't boot (long boot logo and eventual automatic restart to recovery). Ultimately, I just permanently installed twrp and was going to wait till the weekend to try root again in case there were issues. I'm currently booting from slot A. How do I install magisk now in recovery? Should I be in slot A or B in recovery for install? Or can I now just do it from magisk manager? Thanks for the info.

thejase said:
So magisk installs to the opposite partition you're currently booting from? Only reason I ask is because previously, I missed the second reboot before installing magisk and the phone wouldn't boot (long boot logo and eventual automatic restart to recovery). Ultimately, I just permanently installed twrp and was going to wait till the weekend to try root again in case there were issues. I'm currently booting from slot A. How do I install magisk now in recovery? Should I be in slot A or B in recovery for install? Or can I now just do it from magisk manager? Thanks for the info.
Click to expand...
Click to collapse
I am not entirely sure if it does or not, but again the A/B partitioning puts things in the boot partition instead of the partitions you are used to. Installing TWRP changes the boot partition, so you need to reload that boot partition before installing magisk will work right.

tabletalker7 said:
I am not entirely sure if it does or not, but again the A/B partitioning puts things in the boot partition instead of the partitions you are used to. Installing TWRP changes the boot partition, so you need to reload that boot partition before installing magisk will work right.
Click to expand...
Click to collapse
I guess I'll just try this upcoming weekend to install magisk via the manager inside Android. I'll try to remember to report back. Thanks for the help.

thejase said:
So magisk installs to the opposite partition you're currently booting from? Only reason I ask is because previously, I missed the second reboot before installing magisk and the phone wouldn't boot (long boot logo and eventual automatic restart to recovery). Ultimately, I just permanently installed twrp and was going to wait till the weekend to try root again in case there were issues. I'm currently booting from slot A. How do I install magisk now in recovery? Should I be in slot A or B in recovery for install? Or can I now just do it from magisk manager? Thanks for the info.
Click to expand...
Click to collapse
tabletalker7 said:
I am not entirely sure if it does or not, but again the A/B partitioning puts things in the boot partition instead of the partitions you are used to. Installing TWRP changes the boot partition, so you need to reload that boot partition before installing magisk will work right.
Click to expand...
Click to collapse
thejase said:
I guess I'll just try this upcoming weekend to install magisk via the manager inside Android. I'll try to remember to report back. Thanks for the help.
Click to expand...
Click to collapse
As promised, I'm writing back with my findings. I believe some enabled module in magisk was the issue. What I did was uninstall magisk 18 with the latest uninstaller. Thinking it was V18 itself that was the problem, I then proceeded to install v17.3 on both slots (reboot to recovery in betweene). This worked and booted! It started to occur to me that I had not disabled any of my modules before installation of the rom/magisk. This is a big mistake as a lot of magisk modules are still using old formatting and cause new installations to fail if left enabled. Since an uninstall also disables all modules, I believe using 17.3 was not necessarily the solution but rather either disabling modules before an install, or uninstalling whatever version magisk was installed to begin with (which essentially disables/uninstalls those modules anyway). After installing 17.3 and getting it to boot, I just updated via magisk manager to v18 with no issues to speak of! Now comes the part where I need to remember all the installed modules I had and test them one by one.
For uninstallation of modules in twrp, you can use https://forum.xda-developers.com/apps/magisk/module-tool-magisk-manager-recovery-mode-t3693165 Or https://forum.xda-developers.com/showpost.php?p=72542167&postcount=242&nocache=1
I hope this helps someone!

GUIDES How to install multirom dual pie ROMs with magisk rooted on whyred

I found a way to install dual pie ROMs rooted with magisk on whyred.
Prepare for the files from this link
https://forum.xda-developers.com/redmi-note-5-pro/development/multirom-whyred-t3765451/page1
You need Multirom, multirom twrp, magisk and rom.
I tested havoc os and evolution x. And they both work.
Known issue
Lock screen security such as PIN can only work on one rom.
If you do not wanna keep old rom and wanna flash all new.
Steps
1. Reboot to recovery.
2. Wipe system data cache and so on.
3. Flash multirom and multirom twrp.
4. Reboot to multirom twrp.
5. Flash the Rom and magisk and reboot to system.
6. Install the newest magisk manager and check if magisk work and it should be working.
7. Reboot to multirom twrp.
8. Make a Backup system system image data boot est.
9. Add multirom from backup.
10. Reboot to system and reboot to multirom twrp.
11. Flash multirom again.
12. Reboot to the second rom and magisk should work on both ROMs.
If you wanna keep old rom. Just make a backup.

what am I doing wrong?

So I'm bootloader unlocked for 10.0.0.1 I'm about to update to 10.0.3.
Everytime I try to flash recovery or boot recovery with twrp it doesn't work.
If I load it via magisk it works sometime but other times causes bootloops.
My biggest issue is booting/flashing twrp and When I flash a custom rom.
It says to flash on A and B. Sometime I can flash to one but when u change to other slot it wolnt flash or it'll show like it's encrypted any help? I've been on basic OS with NoLimits but now I wanna do kernel, rom flashing etc. Help?

If you want to update from .1 to .3 just do this(keeping in mind that you already had twrp and magisk)
Put update.zip in your internal storage
Go to settings>system>updates>local upgrade
Select update and install
Wait to finish but DONT REBOOT
go to magisk and install twrp installer(I use V3.3.1-74)
Then install magisk to inactive slot(after ota)
Reboot and that's it!
You can install custom kernel from twrp or fk kernel or any other app
If you want to install a rom you had to install to both slots(keep in mind that ROMs always be installed on inactive slot)
So make a factory reset(default by twrp wipes data and dalvik)
Install your rom and don't reboot(example if you are on A slot it will be installed to B)
Install twrp installer
Reboot to recovery( this will change slots A to B for example)
Install your rom (slot B to A and you will have your rom in both slots right?)
Again install twrp installer
Reboot to recovery
Flash gapps( if rom don't have it) magisk and kernel I personally recommend to flash after first boot
EDIT:
And another thing, if you get your internal storage encrypted and you can't access your rom,gapps,magisk you can always use adb sideload:
In your platform tools folder put your rom,magisk, etc and in twrp go to advanced>adb sideload and swipe to initiate.
In your command window use this:
adb sideload <nameofyourfile.zip>
Example: adb sideload magisk.zip
This will transfer and install magisk, ROMs and gapps
Sent from my OnePlus7Pro using XDA Labs

Here's the hinge on the rom right? Install on slot in recovery OK good got it. Reboot recovery try to install on other slot there is nothing on phone or its encrypted.

Android 10 & Custom ROM & Slot A + B

Hello Android developers and enthusiasts,
I've been installing ROM since 2011 so I would not call myself a n00b however I seemingly cannot install an Android 10 ROM without issues. So this is a plea for help and advice!
I know you need to have OOS installed before you install a custom ROM so I use Auto Flash ROM to install OOS with Android 9 via System Update. I then boot and set up phone, install update, reboot and then install the OOS android 10 via the System Update. I then have a OOS installed with Android 10.
Why would I use such an elaborate method you may ask? Well, I tried to download latest OOS from OnePlus site and wipe phone and then install OOS but that fails (didn't record the error I'm afraid).
I then download all the ROM + dependencies on an USB stick and use fastboot to flash Mauronofrio TWRP. I then follow the steps in the ROM instructions. For EvolutionX these were:
First Time Install / Clean Flash
- Have OOS 10.3 flashed to both slots!!
- Boot to recovery
- Flash BUILD.zip (TWRP built-in)
- Wipe Cache
- Format data
- Reboot to recovery (optional)
- Flash Magisk.zip (optional)
- Reboot to system & #KeepEvolving
Click to expand...
Click to collapse
I followed these to the letter but when i rebooted system I got a snapdragon error and it wouldn't even boot into TWRP until I used fastboot to flash boot into TWRP. I also tried HavocROM and same happened.
I did manage to install Syberia using above method but I didn't like the ROM that much unfortunately.
Finally, I've also read up a lot on Slot A and B but it still is not very clear to me. I think I understand it but what happens does not confirm my theories
I therefore have some questions:
- Should I be able to wipe my phone and install OOS on a wiped phone and then install a custom ROM?
- When I install ROM and it says "Reboot Recovery" and then install ROM again. But if I check what slot is being used the reboot doesn't seem to change the slot. My assumption was that booting recovery was to install ROM in the other slot. Is that correct?
Any other tips you can give me?
Again, I like to stress I am not new to installing custom ROMs so I am a bit disappointed that this is causing me such grief.
Following some answers I will retry tomorrow so I can give some more details if needed. For now, appreciate any help.

roel1976 said:
Hello Android developers and enthusiasts,
I've been installing ROM since 2011 so I would not call myself a n00b however I seemingly cannot install an Android 10 ROM without issues. So this is a plea for help and advice!
I know you need to have OOS installed before you install a custom ROM so I use Auto Flash ROM to install OOS with Android 9 via System Update. I then boot and set up phone, install update, reboot and then install the OOS android 10 via the System Update. I then have a OOS installed with Android 10.
Why would I use such an elaborate method you may ask? Well, I tried to download latest OOS from OnePlus site and wipe phone and then install OOS but that fails (didn't record the error I'm afraid).
I then download all the ROM + dependencies on an USB stick and use fastboot to flash Mauronofrio TWRP. I then follow the steps in the ROM instructions. For EvolutionX these were:
I followed these to the letter but when i rebooted system I got a snapdragon error and it wouldn't even boot into TWRP until I used fastboot to flash boot into TWRP. I also tried HavocROM and same happened.
I did manage to install Syberia using above method but I didn't like the ROM that much unfortunately.
Finally, I've also read up a lot on Slot A and B but it still is not very clear to me. I think I understand it but what happens does not confirm my theories
I therefore have some questions:
- Should I be able to wipe my phone and install OOS on a wiped phone and then install a custom ROM?
- When I install ROM and it says "Reboot Recovery" and then install ROM again. But if I check what slot is being used the reboot doesn't seem to change the slot. My assumption was that booting recovery was to install ROM in the other slot. Is that correct?
Any other tips you can give me?
Again, I like to stress I am not new to installing custom ROMs so I am a bit disappointed that this is causing me such grief.
Following some answers I will retry tomorrow so I can give some more details if needed. For now, appreciate any help.
Click to expand...
Click to collapse
Hi!
I had this exact same problem a couple months ago. Rebooting to recovery used to change slots for me, but then it stopped.
What you can do is change active slot manually on Reboot section. By doing this, you don't even have to reboot to recovery in other to flash the other slot (altough I do it just to be safe).
And remember: the rom is flashed on the inactive slot, so after the final flash you gotta change slots one more time.

When you flash one ROM on top of another different ROM, particularly OOS to custom, always wipe data and not format data, because some custom ROMs do not support being unencrypted in the first time and then encrypt on the first boot. So do it like this:
Flash OOS
Flash TWRP
Reboot recovery
Flash OOS
Flash TWRP
Reboot system
Complete initial setup
Reboot to recovery
Wipe (not format) data
Flash custom ROM (start here for dirty flashing ROM update)
Flash TWRP
Reboot recovery
Flash custom ROM
Flash TWRP
Reboot recovery
Flash Magisk
Reboot system
I don't like built-in TWRP in custom ROMs. I always use @mauronofrio's TWRP. So regardless if the custom ROM I'm using has TWRP built-in or not, I always use the method above. I didn't have a problem with installing ROMs using his TWRP. Slots always switch when flashing ROM.

Thanks for the info, it really helps.
One question: in your experience can you wipe your phone and then installl OOS on the wiped phone?

So I just booted into TWRP, did standard wipe action: Data, Cache, and Dalvik. I then try to flash the latest OOS zip and I then get this error:
Error applying update: 7 (ErrorCode::kInstallDeviceOpenError)
Updater process ended withL ERROR: 1.
Error installing zip file: '/usbstorage/00, INSTALL/OnePlus6Oxygen_22_OTA_044_all_2002220042_a46425f1bfe43d2.zip
FIXED: I was using TWRP 3.3.1.11 and I then found out there was a newer version: 3.3.1.18 which you can get here: https://sourceforge.net/projects/mauronofrio-twrp/files/Enchilada/
I am now able to install OOS from scratch (ie wiped phone).

remewer said:
When you flash one ROM on top of another different ROM, particularly OOS to custom, always wipe data and not format data, because some custom ROMs do not support being unencrypted in the first time and then encrypt on the first boot. So do it like this:
Flash OOS
Flash TWRP
Reboot recovery
Flash OOS
Flash TWRP
Reboot system
Complete initial setup
Reboot to recovery
Wipe (not format) data
Flash custom ROM (start here for dirty flashing ROM update)
Flash TWRP
Reboot recovery
Flash custom ROM
Flash TWRP
Reboot recovery
Flash Magisk
Reboot system
I don't like built-in TWRP in custom ROMs. I always use @mauronofrio's TWRP. So regardless if the custom ROM I'm using has TWRP built-in or not, I always use the method above. I didn't have a problem with installing ROMs using his TWRP. Slots always switch when flashing ROM.
Click to expand...
Click to collapse
I tried this method and everytime I can't seem to flash oos onto the other slot because when it reboots to recovery the folder is encrypted so I can't see which file is the zip. How do I flash the seccond OOS if it shows up encrypted in TWRP.
I have a OnePLus 6 with the latest OOS now because I got into boot loop and i used a flash-all.bat to get back to stock. I also use maronofrio's twrp because that works.

harshybar said:
I tried this method and everytime I can't seem to flash oos onto the other slot because when it reboots to recovery the folder is encrypted so I can't see which file is the zip. How do I flash the seccond OOS if it shows up encrypted in TWRP.
I have a OnePLus 6 with the latest OOS now because I got into boot loop and i used a flash-all.bat to get back to stock. I also use maronofrio's twrp because that works.
Click to expand...
Click to collapse
If you can boot OOS fine, try to do a local update so that both slots have OOS. Then try to flash a custom ROM again using the method I've mentioned.

remewer said:
If you can boot OOS fine, try to do a local update so that both slots have OOS. Then try to flash a custom ROM again using the method I've mentioned.
Click to expand...
Click to collapse
When you say local update you mean while I am running the rom, go to settings then do update from local source?

harshybar said:
When you say local update you mean while I am running the rom, go to settings then do update from local source?
Click to expand...
Click to collapse
Exactly

GuestD2559 said:
When you flash one ROM on top of another different ROM, particularly OOS to custom, always wipe data and not format data, because some custom ROMs do not support being unencrypted in the first time and then encrypt on the first boot. So do it like this:
Flash OOS
Flash TWRP
Reboot recovery
Flash OOS
Flash TWRP
Reboot system
Complete initial setup
Reboot to recovery
Wipe (not format) data
Flash custom ROM (start here for dirty flashing ROM update)
Flash TWRP
Reboot recovery
Flash custom ROM
Flash TWRP
Reboot recovery
Flash Magisk
Reboot system
I don't like built-in TWRP in custom ROMs. I always use @mauronofrio's TWRP. So regardless if the custom ROM I'm using has TWRP built-in or not, I always use the method above. I didn't have a problem with installing ROMs using his TWRP. Slots always switch when flashing ROM.
Click to expand...
Click to collapse
@Cypher_01, Try this guide. This worked for me. I did not reinstall Nikgapps. Maybe that's where the problem lies? Don't forget to change the update slot at the end before you restart.​