yashsingh1/xdaforums huggingface dataset:
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Striatum_bdr:
Magisk works flawlessly. You can't generalize only referring to your own experience. This is a classical cognitive bias. You have an issue. The others don't.

You can't flash a recovery on a different phone than the one it was developed for even if the phones seem similar. In fact I don't understand why you went to op6 threads to grab TWRP, and report in OP6t TWRP thread it doesn't work. Just go on first post on the current thread and grab the good version of TWRP.... Which is twrp 3.3.1-31 fajita
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Arkmars20:
Thanks for your suggestion but I never use security. My phone's encrypted but I never use password, pattern or fingerprint security
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] sronweb:
This is the point. If the phone is encrypted please try to remove encryption and back up with TWRP, then you can encrypt again.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Arkmars20:
I've never heard of having to remove encryption for a Twrp backup. Have you removed encryption, backed up then encrypted again? If so, could you provide steps for me please
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Striatum_bdr:
One of the main point of TWRP is to be able to deal with encrypted phone. If it doesn't work it's an issue.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] sronweb:
Unfortunately I could not test it by myself yet because I need the phone for daily usage. But when I tried to restore a nandroid backup it was completed correctly (apparently) but was never rebooting on the rom, so I got the suggestion to remove any encryption. I hope that OP can make a clear statement or procedure about this point.

As you may remember, when TWRP development started, the encryption was the main problem to get a working recovery on our phone. Since the recent versions of TWRP we can finally use the recovery to flash a rom or other software from TWRP, which is the first step.

As i understood the backup and restore of nandroid still has issue with encrypted partitions.

Also we should check which partitions are restored. I know that only some partitions should be selected during the process (please, see my previous posts here).

But as soon I will have the possibility to test it personally I will post a step by step procedure.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Striatum_bdr:
I remember perfectly the beginning as I was one of the testers of first versions of TWRP for our phone.

That said, a fully working TWRP must deal correctly with encrypted /data. If it doesn't it's an issue. Clearly a very very difficult to fix as Google is changing its way of encrypting every other day.

As I stay with OOS I don't need TWRP but that means that backing up apps and their data must be done from within Android, and evidently personal data too but you can have them easily on the cloud.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Megadoug13:
Can someone please for the love of god send me to the tutorial for the damn oldkeymaster.zip. the original link is 404 and literally no where to be found on google. this is the only method that works for me and i cant find anything useful because XDA desktop site f-ing sucks and i cant read anything this way
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Dr. Mario:
I concur... Very annoying, and that made it harder to install the clean installation of the custom operating system of your choice without bricking it in the first place. OxygenOS 10.3.1 have some amazingly hairy UEFI encryption at work... Just installing the ROM the normal way just corrupts the keys... To the whole SSD. So I had to find an answer... I finally installed the fully bootable LineageOS 17.1 installation. Meh. It's like Google is already Apple with an exception to the rule, perma-locking of the bootloader is optional (although that angers me more - the landfills are already full at that point...)

EDITED: Think I will keep a separate USB flash drive and USB 3.0 USB-OTG adapter to hold the OS files and TWRP to reinstall when I do tethered boot to redo everything over again. Just dealing with OxygenOS 10's SSD encryption quirks drive me crazy.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] oscarmaldonado:
Delete.

---------- Post added at 08:58 AM ---------- Previous post was at 08:55 AM ----------

[/COLOR]

PM me bud, I can help you with that.

---------- Post added at 08:59 AM ---------- Previous post was at 08:58 AM ----------

Delete.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] HD2userr:
Hello, you right ! That enchilada is for OnePlus 6 and fajita is for OnePlus 6T ! It was wrong linked they corrected it !

Regards, for the info !
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] maxkolonko123:
Hey guys,

I`ve finally decided to update from 19.0.17 to Oxygen 10.3.1 and boom phone doesnt fk..... load

Basically what i did is :

Flash 10.3.1 OTA

Flash TWRP 3.3.1-31 fajita

Boot to recovery

Flash magisk 20.3

Reboot to system - and im stuck on loading screen ( two white doats circrling and system doesnt load )

So i tried this method but using versions i posted above like 10.3.1 twrp 31 and magisk 20.3 thinking it will sort my issue out :

Flashed 10.0.1 (NEW STABLE) Rom in TWRP -28>

Flashed TWRP -28

Flashed Magisk 20.1

Rebooted to recovery>

Flashed 10.0.1 (NEW STABLE)>

flashed TWRP -28>

Flashed Magisk 20.1>

Rebooted to TWRP again flashed Magisk 20.1>

Lastly booted to system..

But yet im stuck on loading screen :crying::crying:

Can someone please help me out cause i dont know what else i can do :(
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] trinidude4:
Did you have any magisk modules installed that might cause a conflict with 10.3.1?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] TENlll423:
Flash correct Magisk version uninstaller first..

Also may want to flash the fake India partition zip too last... Good luck.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] cjnaz:
Check out tibuscrape
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] void4ever:
I would flash 10.3.1 in TWRP and then let it boot completely. ( Yes this wipes TWRP and it's not rooted).

Once you have a proper first boot, side load the TWRP img, flash it, reboot to recovery (to make sure it took) and flash Magisk.

IMO a lot of the issues people are having going from 9 to 10 is it's not writing the new firmwares properly upon the first boot (from 9 to 10). I had the EXACT same issue as you, then just out of the blue i was like, I wonder if it'll boot stock before i go messing with it, and it did.

Void4ever
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] cjnaz:
Not hearing anyone say they are successful restoring TWRP backups that were made with encrypted /data, until this is known working is it fair to say that doing TWRP backups without decrypting first is pointless? I have about 100GB on /data that is encrypted. I don't see where to turn off encryption - "Encrypted" and grayed out in Settings > Security & lock screen > Advanced > Encryption & credentials. Is it correct that all of the data would have to be decrypted and rewritten to /data, then TWRP backup, then reenable encryption and rewrite all the data again?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Striatum_bdr:
You can't turn it off. The only way is to format /data.

Which is not feasible every time you need to change your ROM

-personal data: we are in 2020 so use cloud storage! I use it on my computers, my phone, I don't care anymore about my personal data

- apps: I use Swift backup as I didn't manage to make TiBu working to make a single app backup. Or use Google features to restore apps, but evidently without their data. And I don't really need it as I don't do custom ROMs anymore.

- sms, logs: Google built in backup or any backup app

So in fact you don't need TWRP for backups. Plus, when changing ROM it's usually not recommended to perform a TWRP restoration as you must get rid of system settings that are not the same among the different ROMs.

As said previously encryption in Android 10 causes issues with many phones / TWRP, it's not specific to OnePlus. So we should probably better learn to do without TWRP backup feature.

Or keep our data unencrypted. But it's not recommended. And difficult to do with stock ROM as encryption is by default there.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] hightension:
openrecoveryscript

Hello, seems not possible to use the openrecoveryscript option, is there any way to do it ?

would be useful for automatic backups
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Luigi01:
Unable to boot in twrp

Hi. I was in OB4 and I tried to boot into twrp as described. Then I installed 10.3.1 and now I'm unable to boot it. Both times i tried to lock and unlock again the bootloader, but nothing happened. It says:

Sending 'boot.img' (30752 KB) OKAY [ 0.686s]

Booting FAILED (remote: 'unknown command')

fastboot: error: Command failed

Thank You!
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Aaditya66:
How to install please help as I'm a Newbie.

So I am using an OnePlus 6T which is running on Oxygen OS 10.3.1 .

I want to install the TWRP so please tell me the procedure to install it once I have downloaded the twrp files.

Ps. Is it compulsory to flash Magisk? and if yes this which version is compatible with OOS 10.3.1?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] goferos:
Read 1st post.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Aaditya66:
Damn thank you so much! I did read the first post. But this comment of yours gave me a sudden confidence boost. Do tell me how to install Magisk..

I mean tell me if this steps are correct?

1. Install Magisk Manager Apk

2. Boot into TWRP

3. Flash Magisk

4. Clear dalvik cache

5. Reboot into system.

Which version of Magisk is to be used? And have I skipped any of the step?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] goferos:
If you have already twrp easiest way to install magisk is just to flash zip. Magisk APK will be installed while you flash zip in twrp so no need to install manager first.

I try to use updated thing so I can recommend 20.3 magisk right now. No issues at my side.

I'm glad I could help.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] nihilista:
Pls do a little search, you will find the "OnePlus 6T Guides, News, & Discussion"-Forum

and there is this thread: https://xdaforums.com/oneplus-6t/how-to/guide-oneplus-6t-unlock-bootloader-t3851789

Btw, you don't need to install magisk, only if you want root. If you have a clean OOS there is no twrp you can boot, so you have to follow the guid and you are fine ;)

Maybe "Just Search..." is not helpful, but there are so many guys asking the same questions again and again, so dont be angry about people that don't give helpful answers :)
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Aaditya66:
Thank you so much finally got my device rooted.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] barguybrady:
Unable to Download TWRP "Stackpath" Error ?

Title says it?

Cannot download an updated TWRP from Android File Host:

Has anyone ever encountered this?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] sronweb:
No. Links are fine for me. Try another browser.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] mattish.91:
Update: TWRP works with Magisk 20.3 for me, not exactly sure why it still specifically says "Magisk 19.4" since obviously 20.3 is working fine here.

What i basically did since i already had Magisk 20.3 installed, woking fine but TWRP was missing some how?

1. Install TWRP as a Magisk module

2. Update Magisk to 20.3 (direct install) (reinstall)

3. Reboot (works fine)

4. Reboot to recovery (works fine)

5. Reboot system (works fine)

6. Reboot recovery (works fine)

Yea, last two steps were just to make sure TWRP was still infact working fine, and yes it does (at least for me).

I think we are fine installing Magisk 20.3 as of right now?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] osm0sis:
First post is just way outdated.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Striatum_bdr:
Most of the times first posts are a trap. They are very rarely updated but they are the first logical step to start with a Dev project

How can you imagine that the only Magisk version to use was a more than a year old version? Always check the date of latest post modification, if it's too old read instructions with z certain detachment.

The real question : is [MENTION=4712355]mauronofrio[/MENTION] still around there?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] goferos:
Yes, he's with us. Around 20 of January he updated twrp to 31ver.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] mikiwinds:
Hi, oneplus 7 latest beta and latest magisk too for me, how can i remove fake.india partition? thk
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] mauronofrio:
TWRP 3.3.1-32 OnePlus 6T (fajita) by mauronofrio:

- Fixed a problem of cpu usage, thanks to [MENTION=4898097]arter97[/MENTION] for bugreport and tips.

TWRP 3.3.1-32 Pie Unofficial by mauronofrio

TWRP 3.3.1-32 Q Unofficial by mauronofrio

TWRP 3.3.1-32 Unofficial Installer by mauronofrio
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] mauronofrio:
I don't know why i'm not receiving notifications mails from this thread anymore, what's the problem?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] void4ever:
Installed and working great! As always [MENTION=4712355]mauronofrio[/MENTION] thank you for the continued work and support on this device!

Void4ever
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Base2:
Two Questions

Can you provide md5sums to check our downloads?

Why the change from androidfilehosts to sourceforge?

Thanx as always for the great work.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] kevk60:
Thanks for the update. Installed and performing well.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
Would it be possible to have an AMOLED Black theme of this TWRP?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] mauronofrio:
Actually TWRP doesn't support custom theme
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] shmykelsa:
Well I've applied an AMOLED theme on TWRP

If I recall correctly you have to put ui.zip into /sdcard/TWRP/Theme and then go reload the theme on TWRP. But I've got to re-check correctly the procedure. I've done it a while ago, setup and forgot it
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] seetru:
no problem, thanks for helping us solve this problem, hope you continue to help us
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] peteus:
Yes, backup and restore works with Boot, system, and data partitions only, which is all we need.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Araa01:
I hoope soo! [emoji7][emoji3059]

Wysłane z mojego ONEPLUS A6013 przy użyciu Tapatalka
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Causical:
Making our phone great AGAIN...(remember AGAIN) ...'Murica
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] wangdak:
So with this new, unofficial TWRP if new OOS update will pop out, I can just flash it through system and TWRP and Magisk will stay in my phone?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] jeanxx:
Any way to tell TWRP to auto use password for decryption?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] cultofluna:
If you flashing through system updates you will lose twrp...:D

You need to flash through twrp
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] kantjer:
No, and AFAIK even Open Recovery Script doesn't support passing the PIN yet.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
Only thing i cannot get to work is wiping. Tried to install a rom and i went to wipe and would not work. Could not m2fs or something... Can same error installing the rom zip overtop, dirty. At installation, it allowed me to flash the magisk canary build zip (17.4) so i figured zips worked..
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] ratelutz:
many thx for your support and

enjoy your beer, coffee, tee or what ever ;)
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Striatum_bdr:
Did you choose to leave system partition untouched at first TWRP launching?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] cultofluna:
https://xdaforums.com/oneplus-6t/de...ial-twrp-touch-recovery-t3861482/post78268438
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] H4X0R46:
So it seems some people are having the issue with wiping system and some aren't? Is this rm -rf setting the guaranteed fix? I haven't tried wiping system yet myself.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] cultofluna:
This fixes the " wipe system " issue..
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
Yea i booted into twrp, did nothing but flash installer, then magisk, rebooted, back to recovery, made a backup.. then later on when I went back to wipe and flash something, i got those errors .. i didnt mess with it anymore, but i will try it all again and see what this link below does and find a fix.. thanks guys
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] H4X0R46:
Cool thanks! I'll tick that next time I find myself in TWRP.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Araa01:
We have full working twrp?

Wysłane z mojego ONEPLUS A6013 przy użyciu Tapatalka
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] reppi:
Can you even read? How lazy some people are...
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] maruf25:
Can anyone send link of offical twrp link if it's released
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Aircraft800:
https://xdaforums.com/showpost.php?p=78267079&postcount=299
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] meljohnsony2k:
I've also used it.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] shmykelsa:
That's my UI.zip for instance and I have a beautiful black theme
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Koushik87:
Failed to Install latest TWRP twrp-3.3.1-32-fajita-Q

I am on OOS 10.3.1 stable version. Below is the error -

C:\Users\Koushik\Desktop\fastboot>fastboot flash recovery twrp-3.3.1-32-fajita-Q.img

Sending 'recovery' (30752 KB) OKAY [ 0.696s]

Writing 'recovery' FAILED (remote: '(recovery_b) No such partition')

fastboot: error: Command failed
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
Did you read the OP? I suggest doing that.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Koushik87:
Can you be more specific, i am a newbie and might not get the context.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Causical:
HOW you GON' tell a man who has coded a program he don't know what he TAWKIN' BOUT!? ?...

Lol, just kidding it happens, even Elon Musk encourages it. ??
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
Read the First Post. It clearly has the installation instructions written there. Follow those.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] zaska_:
Checksums are found in sourceforge fajita directory. Click "Mauronofrio's TWRP" header on download page, navigate to Files/Fajita and click info icon.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Base2:
2 Questions

Thanks [MENTION=5713503]zaska_[/MENTION]

It's been ages / years since I used sourceforge for a download. Why they don't just include checksums on the download page itself without having to poke further I don't know.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Koushik87:
Sorry my bad. I thought in android Q have to flash the image everytime for a new update then install the zip installer. Wasn't aware only installer zip is enugh.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] vikram.mohal:
How to make OOS backup ? It's not working in previous build. Thanx
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] TENlll423:
Can this newest twrp build flash ob5 for 6t ok?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] nikosrs4:
due to some issues I had with updating OOS, I flashed latest beta with previous TWRP, so I'm guessing it will be fine!
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Cdneyes:
I just flashed the OB5 with latest TWRP. Success. I am also using the latest Omega kernel. Great battery life
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] OhioYJ:
The command you tried to run can mess things up. Never flash the img file. That's why he was saying to read the first post.

FunkWizard has a good guide here that you might find helpful as well.

If you already have TWRP installed, all you need to do is run the installer zip from TWRP. If you use Magisk make sure you run that zip afterwards as well.

If you don't have TWRP installed, you need to boot the appropriate TWRP img (not flash), then run the installer. Then if on OOS, flash Magisk. FunkWizards guide above would be a good place to get started with a walk through on this process.

Don't want to mess anything up. Being new to the process, backup your data first, just to be safe.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] TENlll423:
I think I downloaded a corrupted file I had to end up wiping my whole phone what a pain in the butt... Lol.... I'm just going to wait for the new stable.,
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Arkmars20:
Thanks for latest 3.3.1-32 update. I had a OnePlus 5T a few years ago with Magisk and Twrp and had an AMOLED Black themed Twrp. I used to see your recovery related posts for 5T with Funk Wizard and codeworkx.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] Arkmars20:
The developer was named Morphine1. He was doing nice themes on Twrp versions for the OnePlus 5T by codeworkx.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] unomas:
If I just take one of these and flash through magisk on my 6T, will it work?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] beardymarrow:
You'd need to flash the installer zip , yes. Remember to reflash magisk before rebooting though, as twrp over writes it.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] ffejy462:
Anybody else fake India zip not work? Even tried to delete the folder manually, but annoying OnePlus"rewards" bs is still in settings...
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] TENlll423:
Try flashing zip again and if that don't do it use total commander...i use it to delete all kinds of system apps

This time the zip worked perfectly for me after I flashed magisk I flashed it and booted to system. .
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] geeksquad2:
I just used solid explorer to rename the India.img file to India.img.ii

Then a quick reboot and voila! A clean settings again.
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] dharkness:
searching through 100's of pages i did not find the answer nor i probably ask the correct query. i have a rooted phone with the stock rom, I followed the instruction and i was greeted with a bootloop of just twrp booting and nothing else. So I just restored a backup so i can get the rom to boot, how am i suppose to install this w/o the loop?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] lilbrat:
A bit more info may help.. which TWRP version did you use, after your install did you reboot back to recovery and install root?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] dharkness:
3.3.1-32-fajita-Q-mauronofrio.img, after install it reboot back to twrp, did not install root was not in the instructions :(
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
How did you install?
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] lilbrat:
Ok.. once you install TWRP, reboot back into recovery and install root.. then reboot to system..
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] dharkness:
Install fastboot tools from google's sdk on your PC

2. Enter fastboot mode

3. Unlock your bootloader

4. Run "fastboot boot recoveryimgfilename.img" in command line

5. Copy the recoveryimgfilename.img in the phone memory

6. Go in advanced menu

7. Click on "Install Recovery Ramdisk"

8. Choose the recoveryimgfilename.img

9. Swipe to install
[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] :
Why not use the TWRP Installer? It's much more simpler.