yashsingh1/xdaforums huggingface dataset:
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] zahidm:
Your dirty flash not goes well, flash ROM and Gapps again in same SLOT and better swipe for factory data reset before.

This issue is in Lineage after dirty flash
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Harsh Keswani:
Flash rom and gapps directly? Or

1)flash rom

2) flash twrp installer

3)reboot

4)flash gapps

5)flash twrp installer

6) reboot
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] zahidm:
Yes this procedure as you mentioned, and better wipe factory data reset, After Gapps no need flash TWRP just swipe to wipe
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Harsh Keswani:
Thank you, it worked. When I flashed the ROM and reboot to recovery I saw that the slot changed, so I boot to the slot where I flashed the ROM and then flashed GApps and wiped. Worked well!
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] tehL5ML2NUE:
[MENTION=5075128]LuK1337[/MENTION] what is up with OTA update? Nothing showing up since 12 Nov for me even though there is a 23 Nov release
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] refai:
Actually it didn't work for me, but I followed

1) flash rom

2) flash twrp installer

3) reboot

4) flash rom again (without worry)

5) flash twrp installer again

6) reboot

7) flash gapps

8) factory reset

9) flash twrp installer

10) reboot

Everything work's fine, but my problem is I can't flash use the root, which Magisk root I should use? Please help me.

I have flashed Magisk-v20.4.zip but crash dump for twice
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Mr.FREE_Bird:
This build of Magisk should work fine: https://github.com/topjohnwu/magisk...e2a53c50eff74fd67b1b3c72157f/magisk-debug.zip
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] refai:
Thanks 👍 it's worked.

---------- Post added at 19:51 ---------- Previous post was at 19:49 ----------

Thanks 👍 it's worked.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] zhangzy:
Just jokingly ask, why do we have two less updates than 6T
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] zeratull:
@LuK1337 Hi Could you add these commits to on trebuchet launcher for double tap sleep. Please

Add double tap to sleep gesture · ResurrectionRemix/packages_apps_Trebuchet@ca7ba83

AICP: Adapted to 10 Change-Id: Icf2cc27a70b904904baab10ca83d17e6ea9bc06e todo: use WorkspaceTouchListener onTouch to handle all touch types Signed-off-by: Varun Date <date.varun123@gmail.com>

github.com
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] byReqz:
Hey guys, im not getting Wifi turned on after a fresh install, also happens on 17.1. Might j have to switch country codes? (EU)
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Opprobrium:
Hey,

Wifi not turning on at all? If Wifi button is pressed it just turns off again after a few seconds? Sounds like a problem I had a while back.

Maybe this might help? Worked for me.

Cheers
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] jameelna978:
@LuK1337 can you please add this to fix the pixelated corners ?

https://github.com/AOSiP-Devices/de...mmit/619527b0cf3344efb105ae52f9da5fc12e39b702

and this one to make the corners of the apps round when switching,quitting,entering an app https://github.com/AOSiP-Devices/de...mmit/57730a77e983be1486945e972004266c1d0c07cb
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] qualo:
Hello. I did a clean install of the new 18.1 rom and i can't have Magisk working. I have tested the modded versions from other ROMs, but with problems. Some of them have root but manager app can't open and in others app works but don't have root. Someone knows how to do It or how can i extract the boot image from the Zip to mod and install It following Magisk instructions?. Thanks

edit: Finally have It working. The problem is related with twrp. I have flashed rom with lineage recovery and then sideload Magisk 21. All works
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] amjz:
What is the lineage recovery? Where I find it? I'm using lineage 18.1 with twrp but magisk not working . plz help
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Ufos92:
Two years later we're still in the A/B flashing mess.

1) why couldn't it be enough to flash ROM into both partitions for the first install?

2) why can't we have a bash-script doing all this mess?

I certainly recall that there was a stock recovery which was systematically overwriting all partitions (for whatever reason there are 120 of them) in an automatic fashion. E.g. no step-by-step guides. Just unzip, run 120 "flash" commands and you're done.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] TreasureSeeker:
Thanks for the info. I tried it and it returned 'ERROR: 1 Error patching kernal. ' so now I'm looking into this error.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] TreasureSeeker:
SOLVED: The problem was with TWRP. I swapped to LineageOS recovery and that solved the problem.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
Fixed on the latest 20210914 build.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
Temporary fix for audio quality issues using Magisk until it's fixed in LOS:

1. Flash Audio Modification Library, reboot

2. Flash Audio Compatibility Patch, use defaults, reboot

3. Install Ainur Narsil, reboot

Installing just Ainur Narsil didn't work for me, but installing all three of these modules did fix it.

Edit: Thanks to LuK1337 a proper fix should be coming soon, as soon as this commit is merged: https://review.lineageos.org/c/LineageOS/android_device_oneplus_sdm845-common/+/315981
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
My slot A hangs when booting into twrp recovery, in contrast to normal slot B what happens if i flash lineageos in both slots ? and do i need to re-flash oos 11 ? maybe i flashed the wrong lineageos in slot A
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] daleloco:
Just installed LineageOS 18.1 for the first time, and Im facin an issue with charging, my phone doesnt fast charge, and I also dont see the option to enable or disable fast charging in settings. Anyone else has the same problem?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
Update to OOS11 vendor firmware: https://wiki.lineageos.org/devices/enchilada/fw_update
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
My phone fast-charges just fine. Mind that LOS won't tell you that it is fast-charging, it will just do it. But I did a direct comparison between my old charging cable (2h) and the new one from OnePlus (40 min), and it did definitely fast-charge.

Edit: If the post above mine recommends an OOS update, there might be a bug I might have missed. Sorry for that.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] daleloco:
It worked! Thank you very much. But I think I found other issue, not sure if its related to LOS or what.... I cant link whatsapp to wpp web, my phone cant read the QR code, it does nothing. Could it be related to a problem of how camera is integrated into apps maybe? Or maybe just a problem of actual wpp version?

Edit: the only problem remaining with charging is the time estimated for full battery capacity, but its not that important.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] ozrex:
Can anyone confirm if "Ok Google" functionality works with latest LOS and OOS11 firmware?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
I have a similar problem with the Signal app. My phone always takes ages reading the QR code. Was much faster on my previous phone. QR code scanner app in general works fine though, so maybe this is an app-related problem...
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] diemadedrei:
Works for me with opengapps
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
Is there any way to update without losing data?

After every new version upgrade I have to reinstall all the apps from scratch, I find it very inconvenient can anyone please help me how to upgrade without having to format factory reset ? I tried updating from update in settings but got error bootlop had to format factory reset.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
For me, the guides in the LineageOS wiki always worked without data loss. Sounds strange to me. I never did an update from (for example) LineageOS 17 to 18 on my OnePlus, though.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
You probably didn't follow wiki instructions correctly. OTA updates work fine for me.

If you are using Magisk - follow Magisk OTA procedure on their site.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
i don't update from 17 to 18, i just update the normal builds
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
Yeah, that should definitely not happen... Maybe it has something to do with your partitions? I am no pro here, and only own a OnePlus for 1 month now, but I read somewhere that you had to flash the ROM to both partitions for the first install... Not sure though, maybe others can help.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
I mean update in OTA update from settings.after download rom and install i got bootlop error and had to go to twrp recovery wipe factory reset I just booted into my system and lost all installed apps.this is similar to when i use adb sideload on lineageos recovery.i tried installing lineageos then booting into the system and updating still failed to bootlop.

I'm not root my phone
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
Did you flash copy-partitions zip before the first LOS install?

Also, just use LOS recovery - I don't think TWRP supports LOS OTA updates.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
Seems I have the same "problem" here. Estimated time until full charge seems way too long all of the sudden (1h 30 from 65 to 100%). Not a huge problem though.

Edit: On the fast charger, he even tells me it'd take 6 hours from 65 to a 100 %. I am quite sure back on OOS10/a few LOS builds earlier the predictions were kinda correct.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
copy-partitions zip ? can you please help me how to do it? before installing LOS I just flashed oos 11 through 2 slots A and B from TWRP recovery then I flashed LOS.What did I do wrong ?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
You didn't follow wiki instructions :)

Install LineageOS on enchilada | LineageOS Wiki

wiki.lineageos.org
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
after I redo it all according to the wiki's instructions, everything is greatThe .rom is very smooth and the temperature is cool, after installing I tried using the OK GOOGLE feature but it didn't work.

I use open gaps and don't root the device Can you please help me one more time? I have tried going into settings and checking but no problem found.

Thank you so much
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] diemadedrei:
Which opengapps were you using?

I use these

https://drive.google.com/drive/mobile/folders/1CvN4tZH_VWX17dI2Hlevgy-HfQolOTTW?sort=13&direction=a

They are built off the official repo but with all packages
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
I can't enable Google apps from settings I received the notice "The Google App isn't your default Assist App"o_O

I use open gaps at source as attached picture and use nano package
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
I'm not sure about Google Assistant - I'm using MindTheGapps and it's not working either.

Edit: Actually, it works fine. Just had to set Google as the default assistant app. D'oh.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] diemadedrei:
Stupid question but have you set Google assistant as your default assistant app?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
I made a mistake and installed it like the picture lol ^^
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kouzelwop32:
Awesome, thanks a lot for the update!
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] daleloco:
Last time I charged my phone it said that it would take 14 hours to full charge, luckily it didnt haha
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
Yeah, same to me, phone charges just fine, just the estimated time is totally off, lmao.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
Does anyone currently work on lineage 18 without errors ?

what version of gcam are you using ?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
I am using the latest build from this site:

Google Camera for the OnePlus 6/6T

Versions of Google Camera compatible with the OnePlus 6 and 6T. Google Pixel Camera for OP6/6T.

www.celsoazevedo.com

With one of the configurations for OnePlus 6. Is quite (not a 100%) stable.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] :
@LuK1337

I request you Please fix pocket mode and status bar touch issue after notch hide please...
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
Except the slow motion video recording mode is faulty, the other features work quite ok

i tried other versions of Gcam 8.2 and 8.3 but got a lot of errors

Thank a lot
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Saksham03:
Calls and clicking power button wakes screen while Prevent accidental wake-up is on (#3469) · Issues · LineageOS / issues / android · GitLab

Expected Behavior Calls and power button should not wake the screen if prevent accidental wake-up is on.

gitlab.com
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] optimumpro:
Receiving a call is NOT an accidental behavior. This is how it should work. You've asked them and they've replied.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Saksham03:
Just to confirm, let's say my phone is in pocket and I receive call, should the screen wake up inside pocket?

Anyways, I wasn't complaining, was just informing about the behaviour to @batteryIow
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] optimumpro:
Pocket mode is there to prevent accidental wakeups. Waking the screen when you receive a call is not an accident and is expected behavior, not a bug, regardess of where the phone is.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] optimumpro:
If you want them to fix something, you must describe your issue, instead of saying 'doesn't work, please fix'. I, for example, read your 4-5 posts about it in different rom threads, and I have no idea what's wrong... .
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] diemadedrei:
Also, what the **** do you expect here? This is a free rom, that people develop in their free time. Not a multi million dollar backed project. Calm down. And as the post above mentions, please describe your issues, provide logs and then somebody might look into it if there is indeed a problem. I do not understand anything you described so far as well
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] :
I think i am not able to explain my problem to you guys, and sorry for my rude behavior...✌️🙂
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
According to the "Recent changes", the time-to-full problem while charging will be fixed in the build tomorrow.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] resol341:
Is anyone else having audio/video playback issue with the 0914 build? All media play back on my device would pause intermittently every few seconds and continue on. During the pause, the progress bar would not move forward, but when resumed, the bar jumps ahead and the audio continues on from a few seconds later. Happens on multiple apps (youtube, pocket cast, plexamp).
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] qualo:
Yes, same for me. OOS 10.3.12 and last LineageOS with NikGapps and Magisk
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
No issue here for me with YouTube Vanced.

Edit: OOS11 and latest LineageOS build from 09/14.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] diemadedrei:
No problem here. You should upgrade your base firmware though. OOS 11 is required
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] qualo:
Thanks. I didn't know and I've seen it now on LineageOS wiki. I'll do it tonight.

Edit: updated and problem solved. Thanks again
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] lord high executioner:
Where does it say that? I can't find any mention of that requirement.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kouzelnik3:
Here it is: https://wiki.lineageos.org/devices/enchilada/fw_update
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] lord high executioner:
Well, that merely describes the procedure -- but it doesn't mean 11 is required (yet).

And BTW, it's not even available at oneplus.com but apparently only via that OxygenUpdater app (with ads and in-app purchases not an entirely agreeable proposition).
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] diemadedrei:
Install LineageOS on enchilada | LineageOS Wiki

wiki.lineageos.org

It says it here to be exact. Whether it is agreeable to you, nobody cares, OOS 11 is required. The updater app works just fine, the ads are not too bad.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] lord high executioner:
I do care. But I honestly don't care whether you care or not.

Please, keep your judgemental comments to yourself and don't litter the forums with it, thank you.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] LuK1337:
If you care then you can compile oxygen updater app without ads or even read what API calls it does and do them yourself.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
Here is a thread on XDA with mirrors for all the official OOS versions, if you are searching for one. Got my OOS from there, too.

https://xdaforums.com/t/oneplus-6-r...icial-oxygen-os-roms-and-ota-updates.3792244/
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Evon88:
hi, is this good rom for gaming? and can i install in on A11 vendor??????
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] hasan4791:
Don't think its a user issue. Having same issue since the day updated to OOS 11. All optimization related settings for the app is turned off & still the issue isn't resolved yet.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Spaceoid:
I play Wild Rift on it without any problem. Others reported some heat problems during the last few weeks, which I cannot confirm, but they might play more hardware demanding games.

And yes, you can, I recommend you to just read the first post and the official instructions in the LineageOS wiki; the links for that are also in the first post.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
I am using this game for gaming Everything works fine,Try it and you won't regret it.But remember to follow the wiki when installing.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] Evon88:
thank you, i installed custom kernal and i need to restore stock kernal pls u know how?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] lamahgra:
since the last 10 updates "WLAN" function is broken....

had gone back to OxyOS11 - WLAN works out of the box

oem unlock

twrp 3.5.2_9-0

full wipe

install latest los 18.1

reboot

in wizard ... WLAN tries to activate ... but broken

(also uses unbricktool - OOS10.3.8 + Updates)

after wizard ... tried to enable WLAN

QtiCarrierConfigHelper: WARNING, no carrier configs on phone Id: 0
09-13 15:11:00.015 2335 2335 D KeyguardClockSwitch: Updating clock: 15:11
09-13 15:11:03.676 841 841 E android.hardware.wifi@1.0-service: Failed to write driver state control param: Invalid argument
09-13 15:11:03.677 841 841 E android.hardware.wifi@1.0-service: Failed to load WiFi driver
09-13 15:11:03.677 841 841 E android.hardware.wifi@1.0-service: Failed to initialize firmware mode controller
09-13 15:11:03.678 841 841 E android.hardware.wifi@1.0-service: Wifi HAL start failed
09-13 15:11:03.680 1580 2176 E HalDevMgr: Cannot start IWifi: 9 ()
09-13 15:11:03.680 1580 2176 E WifiVendorHal: Failed to start vendor HAL
09-13 15:11:03.680 1580 2176 E WifiNative: Failed to start vendor HAL
09-13 15:11:03.680 1580 2176 E WifiNative: Failed to start Hal
09-13 15:11:03.680 1580 2176 E WifiClientModeManager: Failed to create ClientInterface. Sit in Idle
09-13 15:11:03.682 1580 2176 D WifiScanRequestProxy: Sending scan available broadcast: false
09-13 15:11:03.682 1580 2179 I WifiScanningService: Received a request to disable scanning, UID = 1000
09-13 15:11:03.683 1580 2179 I WifiScanningService: wifi driver unloaded
09-13 15:11:03.684 1580 2176 I WifiScanRequestProxy: Scanning is disabled
09-13 15:11:03.685 1580 2176 D WifiClientModeManager: received an invalid message: { when=-20s345ms what=2 arg1=2 target=com.android.wifi.x.com.android.internal.util.StateMachine$SmHandler }
09-13 15:11:03.685 1580 2176 E HalDevMgr: IWifiEventCallback.onFailure: 9 ()
09-13 15:11:03.686 1580 2176 D WifiController: STA disabled, return to DisabledState.
09-13 15:11:03.686 1580 2176 D WifiController: EnabledState.exit()
09-13 15:11:03.686 1580 2176 D WifiController: DisabledState.enter()

GPS also doesn't works for me....

after flashing custom Kerne "mcd_op6x_r5_custom-los" WLAN is ok...

anybody an idea whats wrong?
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] kecodoc:
don't use custom kernel because it's not equal to stock kernel.

want to restore stock kennel there are 2 ways

1 is you flash dirty rom on twrp then format factory

2 you flash the rom via lineageos adb sideload These ways I remember correctly, all have to format factory
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
OOS11 vendor firmware is pretty much a requirement now. OOS10 firmware works just enough to boot, but it breaks WiFi, GPS, dash charging, probably more: https://review.lineageos.org/c/LineageOS/android_device_oneplus_sdm845-common/+/315213/

Stay on OOS11 vendor firmware. Also, use LOS recovery.

Also, if you would have followed the official install instructions on the wiki, you would have known that already. :)
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] lamahgra:
followed:

Install LineageOS on enchilada | LineageOS Wiki

wiki.lineageos.org

Update firmware on enchilada | LineageOS Wiki

wiki.lineageos.org

fastboot flashing unlock_critical

FAILED (remote: ' Device already : unlocked!')

fastboot: error: Command failed

ex.

fastboot flash --slot=all abl abl.img

fastboot: error: Could not check if partition abl has slot all

Sending 'abl' (204 KB) OKAY [ 0.012s]

Writing 'abl' FAILED (remote: 'Flashing is not allowed for Critical Partitions')

(bootloader) Verity mode: true
(bootloader) Device unlocked: true
(bootloader) Device critical unlocked: false
(bootloader) Charger screen enabled: true
(bootloader) enable_dm_verity: true
(bootloader) have_console: false
(bootloader) selinux_type: SELINUX_TYPE_INVALID
(bootloader) boot_mode: NORMAL_MODE
(bootloader) kmemleak_detect: false
(bootloader) force_training: 0
(bootloader) mount_tempfs: 0
(bootloader) op_abl_version: 0x0
(bootloader) cal_rebootcount: 0x31

:cry:
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
Your bootloader is unlocked, so you can skip that step.

Make sure your platform-tools are up to date. That should fix the fastboot flash error.
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] AshraafAzhar:
Back then, I also noticed that fastboot flash --slot=all not working for me when using latest SDK Platform-Tools for Windows (v31.0.3), need to manually specify both slot such as 'fastboot flash vendor_a vendor.img' and 'fastboot flash vendor_b vendor.img'.

The guide from official wiki also didn't work for me. Have a look at MANUAL FLASH: Windows - OSX - Linux for the needed command to flash critical partition(need to use twrp for adb push and flash those critical partitions).

To make it a lot easier, I simply just use Unofficial Android 11 TWRP from Nebrassy and flash both slot with a full fat OOS 11 ROM before flashing Lineageos 18.1
[OnePlus 6 ROMs, Kernels, Recoveries, & Other Devel] CrysisLTU:
fastboot flash --slot=all worked fine for me, using latest platform-tools and LOS recovery. You should flash from LOS recovery fastboot, not via regular fastboot.