yashsingh1/xdaforums huggingface dataset:
[OnePlus 8 Pro  Guides, News, & Discussion] daemon32:
You can install 10.0.10.10 incremental, reflashing 10.0.9.9 with manual updating anf wiping cache with stock recovery. Then you can flash twrp and magisk and have root again.
[OnePlus 8 Pro  Guides, News, & Discussion] jotha.dx:
Hi, where do i download the incremental file?
[OnePlus 8 Pro  Guides, News, & Discussion] dyval:
Using oxygen updater on playstore.
[OnePlus 8 Pro  Guides, News, & Discussion] jotha.dx:
In the oxygen update you only have the full or beta option.
[OnePlus 8 Pro  Guides, News, & Discussion] dyval:
You need to select incremental stable to download incremental.
[OnePlus 8 Pro  Guides, News, & Discussion] Vuska:
Hi... asking again.

my OP8pro is China IN2020, and now have version A11.

If i want to downgrade to Gobal A10 ver 10.5.7, can do this with TWRP ?

or i need to do something before flashing ?
[OnePlus 8 Pro  Guides, News, & Discussion] dyval:
I believe you can flash downgrade zip on TWRP.
[OnePlus 8 Pro  Guides, News, & Discussion] azsl1326:
Where is this option as I don't see it?

Thanks.
[OnePlus 8 Pro  Guides, News, & Discussion] dangtoi1993:
Im running OOS 11.0.9.9.IN11A. system upate notif 11.0.10.10.IN11AA about 123MB.

Im select update but it said can't install update. Now that notif is anoying me.
[OnePlus 8 Pro  Guides, News, & Discussion] FreshlyBaked 420:
11.0.10.10 finally released for global devices. Available on Oxygen Update App.
[OnePlus 8 Pro  Guides, News, & Discussion] Some_Random_Username:
Added OOS 11.0.10.10 (global) to OP.
[OnePlus 8 Pro  Guides, News, & Discussion] GatorsUF:
Can I go from Paranoid Android 12 to the Open Beta 12? I want to get back to stockish OnePlus but the MSM tool isn't working for me.
[OnePlus 8 Pro  Guides, News, & Discussion] omega552003:
Got my answer, I up date with the full install, there is an app called KeepData to prevent the wipe. Then I just flash magisk like normal.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
Added OOS 11.0.11.11 (EU & IN), OOS 12 OB1 as well as OOS 11.0.9.9 downgrade zip to the OP.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
Added OOS 11.0.11.11 (Global) to the OP.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
Added IN2021_11.C.11 (IN) to the first post.
[OnePlus 8 Pro  Guides, News, & Discussion] xgerryx:
Is this the full OTA or incremental? Looks like the full build to me but I want to make 100% sure.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
It's the full zip. We only add full zips to the first post.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
Added IN2025_11.C.11 (Global) to the first post.
[OnePlus 8 Pro  Guides, News, & Discussion] ProfEngr:
Can I use the OOS11 zip I already have to downgrade from OOS12 using the other slot? It's broken several things. I've only found a method that wipes the phone so far. Or maybe just flash Magisk to the unused (should be OOS11 since I just "updated") and reboot back to it?
[OnePlus 8 Pro  Guides, News, & Discussion] xtcislove:
first of all you should not ask your questions in 2 thread and create a 3 one. Thats simple spam.
[OnePlus 8 Pro  Guides, News, & Discussion] ProfEngr:
Maybe, maybe not. Better exposure as not everyone is likely watching the one or the other.

Maybe a fair point. Figured better exposure. Never can tell if the right person (with a solution) is watching the whole board.
[OnePlus 8 Pro  Guides, News, & Discussion] jamescable:
Is 11.c.11 OOS 12?
[OnePlus 8 Pro  Guides, News, & Discussion] FreshlyBaked 420:
Yup
[OnePlus 8 Pro  Guides, News, & Discussion] skoczu:
I have IN2023 and running official IN2023_11_C.15 ROM (received via OTA). I have 100% locked device. Which file should I use to revert it to the latest EU Android 11 ROM? Or should I wait for official rollback pack for my device?
[OnePlus 8 Pro  Guides, News, & Discussion] xtcislove:
Every Rollback Package i know will wipe your data.

So i suggest going the safe and easy way and use MSM tool.

[OP8PRO][OOS 11AA/BA/DA] Unbrick tool to restore your device to OxygenOS

Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been...

xdaforums.com
[OnePlus 8 Pro  Guides, News, & Discussion] Some_Random_Username:
OnePlus posted today on their forums the EU downgrade zip to 11.0.9.9 https://oxygenos.oneplus.net/OnePlus8ProOxygen_15.E.40_OTA_0400_all_2110091931_downgrade that you can use if you can't/don't want to use MSM tool , but you will need to add a .zip extension for it to be recognized by the OxygenOS 12 local update app.

OP will be updated later to add this zip to the index.
[OnePlus 8 Pro  Guides, News, & Discussion] justanutt:
Thanks to all that support this thread. I accidentally flashed an 8T OOS version on my 8 Pro with the fastboot rom. Not good. It got stuck in bootloader mode. Thankfully I was still able to flash twrp and do an ADB side load of the 11.0.11.11 rom. I was back up and running shortly thereafter.

I just wanted to tell everyone that put this thread together thanks.
[OnePlus 8 Pro  Guides, News, & Discussion] thanasis12.:
Link to download ,

eu version, android 12 ?

I want to extract the file .bin, l have already installed android 12, I want to make boot.img etc.
[OnePlus 8 Pro  Guides, News, & Discussion] MariusKv:
I got it from oxygen updater
[OnePlus 8 Pro  Guides, News, & Discussion] kenciroz:
Hello, I don't know it this can be usefu, but here you can download the latest stable oos for op8 pro eu IN2023, based on android 12. I'm not sure, but it looks like that it has been retracted, since even though I downgraded to the android 11 stock, it doesn't find this update anymore
[OnePlus 8 Pro  Guides, News, & Discussion] thanasis12.:
In settings of oxygen updater, the advanced mode>> enable, and I downloaded the firmware, in phone, and copy to PC, and file .bin, boot.img etc.
[OnePlus 8 Pro  Guides, News, & Discussion] GoKity:
Just downgraded from OS 12 to OOS11.0.9.9.INAA on a IN2020

Just to be very sure - if I wish to be updated to the latest OS 11 version, i should perform a local upgrade with the following file found under Signed flashable zips>IN11AA Global?
[OnePlus 8 Pro  Guides, News, & Discussion] Some_Random_Username:
Added IN2023_11_C.15 (first EU OxygenOS 12 build) and 11.0.9.9 EU downgrade zips to the OP.

Yes
[OnePlus 8 Pro  Guides, News, & Discussion] takichiman:
You're on very dangerous water with OnePlus these times... If you'd flashed OP8's, your phone RAM would be grilled by now..
[OnePlus 8 Pro  Guides, News, & Discussion] rysson_:
New Europe 11C16 (?) update come today for my phone.

OnePlus8ProOxygen_15.E.16_OTA_1036_all_2204222258_57eced36.zip

EDIT: sorry, wrong url
[OnePlus 8 Pro  Guides, News, & Discussion] Some_Random_Username:
Added IN2023_11.C.16 (EU) build to the OP.
[OnePlus 8 Pro  Guides, News, & Discussion] zyonee:
My phone is in an awkward state. It's an European model, purchased in Sweden, running IN2023_11.C.15 (EU), but no matter hoe I try, it won't accept the IN2023_11.C.16 package. Regular software update claims my phone is up to date and local upgrade fails.

So I did some research and found out that the set properties in my phone is a mix of the India and EU regions:

OnePlus8Pro:/ # getprop | grep IN
[persist.sys.oplus.region]: [IN]
[ro.bootimage.build.fingerprint]: [OnePlus/OnePlus8Pro_IND/OnePlus8Pro:12/SKQ1.210216.001/Q.202204021758:user/release-keys]
[ro.build.description]: [OnePlus8Pro_IND-user 12 SKQ1.210216.001 Q.202204021758 release-keys]
[ro.build.display.full_id]: [IN2023export_11_C.15_2022040218590000]
[ro.build.display.id]: [IN2023_11_C.15]
[ro.build.display.ota]: [IN2023_11_C.15]
[ro.build.fingerprint]: [OnePlus/OnePlus8Pro_IND/OnePlus8Pro:12/SKQ1.210216.001/Q.202204021758:user/release-keys]
[ro.build.product]: [IN2021]
[ro.build.version.ota]: [IN2023_11.C.15_1150_202204021859]
[ro.odm.build.fingerprint]: [OnePlus/OnePlus8Pro_IND/OnePlus8Pro:12/SKQ1.210216.001/Q.202204021758:user/release-keys]
[ro.oem.key1]: [IN]
[ro.oplus.image.my_bigball.type]: [export_19835_OnePlus_IN_NA]
[ro.oplus.image.my_manifest.version]: [IN2023_11.C.15_1150_202204021859.1B.30461a1d]
[ro.oplus.image.my_preload.version_name]: [my_preload_export_IN_1629187014]
[ro.oplus.image.my_region.type]: [IN_OnePlus]
[ro.oplus.image.my_region.version_name]: [X00IN00]
[ro.oplus.pipeline.region]: [IN]
[ro.oplus.pipeline_key]: [IN]
[ro.oplus.preload.custom]: [2.0.44_IN]
[ro.oplus.region.custom]: [2.0.70_IN]
[ro.oplus.version.my_manifest]: [IN2023_11.C.15_1150_202204021859.1B.30461a1d]
[ro.product.bootimage.model]: [IN2023]
[ro.product.bootimage.name]: [OnePlus8Pro_IND]
[ro.product.model]: [IN2023]
[ro.product.name]: [OnePlus8Pro_IND]
[ro.product.odm.model]: [IN2023]
[ro.product.odm.name]: [OnePlus8Pro_IND]
[ro.product.vendor.model]: [IN2023]
[ro.product.vendor.name]: [OnePlus8Pro_IND]
[ro.vendor.build.fingerprint]: [OnePlus/OnePlus8Pro_IND/OnePlus8Pro:12/SKQ1.210216.001/Q.202204021758:user/release-keys]
[ro.vendor.oplus.regionmark]: [IN]
[ro.vendor.product.oem]: [IN2021]

I can't remember having flashed any India region update previously, but I might have. Is there any way to revert those properties to make it accept an EU update without having to resort to fastboot flashing it and needing to set everything up from scratch again? The currently installed software is the EU region software, so that shouldn't be any issue for the update, I'm just trying to make it accept the EU update zip.
[OnePlus 8 Pro  Guides, News, & Discussion] pantha007:
Am I the only one only getting 5 seconds of a custom notification, I need long notifications. Is the only way reverting back to 11 or have I missed something silly :-( . I know its not just me as my wife's OP8 Pro is doing exactly the same thing (mine is rooted, hers is not).

when selecting a tone it says "the selected audio file will play for up to five seconds"

Please help :)
[OnePlus 8 Pro  Guides, News, & Discussion] piku2008:
Can anyone reupload this zip for oneplus 8 pro

as the link isn't working any more !

IN2021_11.C.11: IN2021_11.C.11_1110_202203150036

MD5: 725ea5e980ef0839e3f8a86856ecd1a0
[OnePlus 8 Pro  Guides, News, & Discussion] Neil_Armstrong_:
Thanks for the work !

IN2023 C.15 says Access denied, i can't download it, don't know if it's only me

Edit : Got this link from The Telegram tracker

IN2023 C.15 :

https://otafsg1.h2os.com/patch/amazone2/INT/OnePlus8ProOxygen/OnePlus8ProOxygen_15.E.15_GLO_1032_2204021901/OnePlus8ProOxygen_15.E.15_OTA_1032_all_2204021901_1b9e6.zip
[OnePlus 8 Pro  Guides, News, & Discussion] lyrebird:
My NA IN_2025 sees a c.20 update. However, updating failed.

Oxygen Updater can't find any update, BTW.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
Added C.16 (Global) and C.20 (EU) to the first post.
[OnePlus 8 Pro  Guides, News, & Discussion] gsser:
Afaik, global version dont have a full zip yet. If ur BL is unlocked you need the full zip.

https://gauss-componentotacostmanual-sg.allawnofs.com/remove-30249e582aea3c189828392ee95b9985/component-ota/22/05/18/984f3efdb6044af99647767862a0b7e5.zip

You can use oos 12.1 A12 c20 europe version (full).

You can use the apk in attachments to install full zip.

P.S., this is not the first time i have seen that global is missing a full zip build. (This happened on oos11 last builds too.) If you want to use global c20, you need to lock BL then install incremental update.
[OnePlus 8 Pro  Guides, News, & Discussion] gsser:
You can see in here, latest full zip for global is c16.
[OnePlus 8 Pro  Guides, News, & Discussion] lyrebird:
Thanks! No need to hurry as I don't see much good change between versions and I have regretted updating to oos 12.

Has to purchase skalvex's call recorder to make call recording is just one of few things I don't like oos12. But I am too lazy to downgrade ....
[OnePlus 8 Pro  Guides, News, & Discussion] jimger:
Well the problem with downgrading is that u then don't have security updates...
[OnePlus 8 Pro  Guides, News, & Discussion] TaRsY:
I have IN2023_11_C.16 on my 8 pro but IN2023_11_C.20 install fails with the local update apk. Strange. :\
[OnePlus 8 Pro  Guides, News, & Discussion] thanasis12.:
In my phone, update c16, to c20, with OTA.

I am using app free VPN.
[OnePlus 8 Pro  Guides, News, & Discussion] shadowstep:
Added C.21 (IN) to the first post.
[OnePlus 8 Pro  Guides, News, & Discussion] Agimax:
Sorry Had Dup Post Below
[OnePlus 8 Pro  Guides, News, & Discussion] chfaure:
For C21 in case of issues with magisk : find

Boot.img : https://nitro.download/view/D90F78DED018B76/boot.img

patched with magisk 25101 : https://nitro.download/view/171C44CE0F0497F/magisk_patched-25101_5JHcJ.img

If you have issue with slot_b : first use fatboot to flash regular boot img to slot b

Set it as active and the verify if it boot OK.

Then you can flash in slot a and set it as active and reboot with magisk enabled !
[OnePlus 8 Pro  Guides, News, & Discussion] hadobac:
May I ask for which OnePlus 8 Pro model? My phone is IN2023 EU, would it work?
[OnePlus 8 Pro  Guides, News, & Discussion] chfaure:
It is for 8Pro working fine in 2021/2025 not tried with 2023 but normally the boot file should be the same.
[OnePlus 8 Pro  Guides, News, & Discussion] x51:
Did you really disable free downloads or am I doing something wrong?
[OnePlus 8 Pro  Guides, News, & Discussion] Nimueh:
I just tried it and had the message that "this file is available for premium only" ... so it's not you o_O
[OnePlus 8 Pro  Guides, News, & Discussion] chfaure:
THis is an error from Nitroflare, I will check why it turned to be premium only.
[OnePlus 8 Pro  Guides, News, & Discussion] x51:
Awesome. Thanks.
[OnePlus 8 Pro  Guides, News, & Discussion] Yuan Xi:
OnePlus 8 Pro (EU IN2023) C.21 full

https://gauss-componentotacostmanual-eu.allawnofs.com/remove-0b052654ff21bde46781a136d9d1cd06/component-ota/22/06/11/27798ffb58c94dac91b2785bef83e002.zip

System

[Improved] system stability

[Fixed] the issue that screen kept on abnormally in certain scenarios after locking

[Fixed] the issue that some gesture operations worked abnormally after enabling the Quick launch

Camera

[Fixed] the issue of crash when opening Ultra Steady in certain scenarios
[OnePlus 8 Pro  Guides, News, & Discussion] Danny1976:
Can this be used to update the EU OP8? Not sure if the OP8 Pro Full OTA will also work on the OP8. My guess is it does not.
[OnePlus 8 Pro  Guides, News, & Discussion] Yuan Xi:
no, only for 8p(in2023)
[OnePlus 8 Pro  Guides, News, & Discussion] Toxicology:
Update cannot be installed due to verification failure....

Oneplus simply ****ed it up, cause Built Number in Update C20 already marked as C21! So there's a problem with the Verification cause of the built number! I'm still on Version C20 but Version Info inside my settings says C21! (see screenshot attached). Maybe this is also the reason, many (me included) don't get the OTA via regular Ugrade Function (not Oxygen Updater!!!)

Is it somehow possible to change the Built Number in Version C20 Zip from C21 to regular C20 an maybe then the latest C21 Upgrade can be installed?
[OnePlus 8 Pro  Guides, News, & Discussion] ShadoV90:
I couldn't install C21 update too due to veeification failed error and i fugured out that it was because i installed c20 update through local upgrade (downloaded via oxygen updater). I wanted to find a way to apply newest update, because i wasn't able to use google pay (safetynet cts profile match fail).

Well... i have now c21 but i needed to rollback to 11.0.9.9.

I needed to wipe data, and through series of official OTA updates i have C21 now. Problem is that i... still can't configure google pay (google wallet now). Safety net is still broken (CTS profile match fail). I'm on fresh system and i'm not even rooted. Idk what i can do to be able to use wallet.
[OnePlus 8 Pro  Guides, News, & Discussion] Toxicology:
Oh damnit 🧐 That is really serious. Sorry for that!!! Seems Oneplus made terrible update already with C20! Hmm... one question: does the wipe for downgrade also wipes Internal storage? Photos and all stuff? So I have to save over 160 GB to an external drive first? 🙄
[OnePlus 8 Pro  Guides, News, & Discussion] ShadoV90:
Yup, it wipes everything. Make a copy of everything you can.
[OnePlus 8 Pro  Guides, News, & Discussion] ablak44:
The gpay troubles had already been resolved a month ago. I used. It works.
[OnePlus 8 Pro  Guides, News, & Discussion] Toxicology:
Oh man... and all settings and stuff again... ok... so I think I'll wait for C22 (or c21.1 or whatever Oneplus will call it). Cause I also have that certification problem with Google Pay... and when you say also set up device from scratch again wasn't successful, I don't want to wipe and everything without any profit!
[OnePlus 8 Pro  Guides, News, & Discussion] Toxicology:
My device isn't rooted and never was!!! So, the problem has to be solved by Oneplus! 😃
[OnePlus 8 Pro  Guides, News, & Discussion] nihilista:
Same problem here. Open payload_properties.txt in update zipfile, modify oplus_update_engine_verify_disable=0 to 1, save zip and try to install with OPLocalUpdate_For_Android12.apk, not default updater. For me that works, but only after deleting date from both updaters, reboot and next try. And i used totalcommander for that, other packer seems not to work. I dont know what did the trick, but after some trying it works ;-)

And gpay/wallet works now, device is verified and cts now ok.
[OnePlus 8 Pro  Guides, News, & Discussion] ShadoV90:
Hmm then i don't know why my unrooted device with C21 version where it was installed through OTA, not third party app, wallet isn't able to add my card, safety net test shows cts profile match failed. Can i do something?

Edit: Nihilista, why didn't you mention that your safetynet is ok, but you're rooted and use safetynet fix module...
[OnePlus 8 Pro  Guides, News, & Discussion] TheArcadion:
I changed the value to 1 already, but the installation failed in both updaters. What do you mean with 'deleting date from both updaters'?
[OnePlus 8 Pro  Guides, News, & Discussion] nihilista:
I mean clean data and cache of apps....
[OnePlus 8 Pro  Guides, News, & Discussion] spideman3:
It didn't work for me. I followed the steps you said.

SOS i need use total commander apk google play​
[OnePlus 8 Pro  Guides, News, & Discussion] Danny1976:
How is that different then doing a clean install? That's basically the same as clean install. If you have to delete your data, it a clean install. Of course if you do a clean install it will work.
[OnePlus 8 Pro  Guides, News, & Discussion] Danny1976:
If anyone is having this problem with the EU C.21 Verification failure..... There are two options.

OPTION 1

App for update:

https://oxygenos.oneplus.net/OPLocalUpdate_For_Android12.apk

Download it, install, run.

3 dots, local upgrade and choose c21.zip

Normal, local update without data loss.

OPTION 2

Fastboot Method commands

- You have to extract the OTA zip file with payload dumper

- Patch the boot img from the extracted payload on your phone first

- Put the phone in Fastboot mode with CMD Command adb reboot bootloader

- The use these fastboot commands: (Make sure your extracted payload files are listed below. If you are missing any... add it to the list and flash each command one by one. xbl_config_lp5.img & xbl_lp5.img not needed and will not flash.

fastboot flash boot magisk_patched.img

fastboot flash dtbo dtbo.img

fastboot flash modem modem.img

fastboot flash recovery recovery.img

fastboot --disable-verity flash vbmeta vbmeta.img

fastboot --disable-verity flash vbmeta_system vbmeta_system.img

fastboot reboot fastboot (Phone will reboot back to Fastboot and select English and continue with the commands)

fastboot flash abl abl.img

fastboot flash aop aop.img

fastboot flash bluetooth bluetooth.img

fastboot flash cmnlib cmnlib.img

fastboot flash cmnlib64 cmnlib64.img

fastboot flash devcfg devcfg.img

fastboot flash dsp dsp.img

fastboot flash featenabler featenabler.img

fastboot flash hyp hyp.img

fastboot flash imagefv imagefv.img

fastboot flash keymaster keymaster.img

fastboot flash logo logo.img

fastboot flash mdm_oem_stanvbk mdm_oem_stanvbk.img

fastboot flash multiimgoem multiimgoem.img

fastboot flash my_bigball my_bigball.img

fastboot flash my_carrier my_carrier.img

fastboot flash my_company my_company.img

fastboot flash my_engineering my_engineering.img

fastboot flash my_heytap my_heytap.img

fastboot flash my_manifest my_manifest.img

fastboot flash my_preload my_preload.img

fastboot flash my_product my_product.img

fastboot flash my_region my_region.img

fastboot flash my_stock my_stock.img

fastboot flash odm odm.img

fastboot flash qupfw qupfw.img

fastboot flash spunvm spunvm.img

fastboot flash storsec storsec.img

fastboot flash tz tz.img

fastboot flash uefisecapp uefisecapp.img

If You have OnePlus 8 (DDR4) You're supposed to flash xbl.img & xbl_config.img

fastboot flash xbl xbl.img

fastboot flash xbl_config xbl_config.img

If You have OnePlus 8 Pro / 8T / 9R (DDR5) You're supposed to flash xbl_lp5.img & xbl_config_lp5.img

fastboot flash xbl_config_lp5 xbl_config_lp5.img

fastboot flash xbl_lp5 xbl_lp5.img

fastboot flash system system.img

fastboot flash system_ext system_ext.img

fastboot flash vendor vendor.img

fastboot flash product product.img

fastboot reboot
[OnePlus 8 Pro  Guides, News, & Discussion] ShadoV90:
I want to ask out of curiosity, as i read in topic "how to avoid killing your device[...]" that:

If You have OnePlus 8 (DDR4) You're supposed to flash xbl.img & xbl_config.img

If You have OnePlus 8 Pro / 8T / 9R (DDR5) You're supposed to flash xbl_lp5.img & xbl_config_lp5.img

I recommend everyone who makes fastboot flashers to include that change or make separate flashers for each codename!

You want us to flash xbl and xbl_config, but not xbl_lp5 and xbl_config_lp5. Sorry, but i'm confused right now as we are using Pro variant.
[OnePlus 8 Pro  Guides, News, & Discussion] Danny1976:
Thanks for the info. I excluded the xbl_lp5.img & xbl_config_lp5.img, because they failed.... So I flashed the xbl.img & xbl_config.img. Didn't know why and thank you for the info. Just updated my post. I am using an OP8, but wanted to help out OP8 Pro, since they are all having this issue.
[OnePlus 8 Pro  Guides, News, & Discussion] nihilista:
You misunderstand ;-) Cleared Data and Cache from all updater apps, i never wiped partitions or something else. Just update full rom with full package and local install....
[OnePlus 8 Pro  Guides, News, & Discussion] Danny1976:
My apologies.... Thank you for correcting me.
[OnePlus 8 Pro  Guides, News, & Discussion] ShadoV90:
Thanks. If someone with OP8Pro will flash xbl and xbl_config (for DDR4) instead lp5 variant, then motherboard will be fried, because ddr4 need more voltage than ddr5.
[OnePlus 8 Pro  Guides, News, & Discussion] nihilista:
Exactly what i did, if i'm not wrong you did the same, just setting oplus_update_engine_verify_disable=1

Maybe the used packer was the problem, or cache+data clear of apps did the trick, but for some it didnt work. For me it works, but my first tries failed. Btw, i would not recommend fastboot method, only for advanced users.
[OnePlus 8 Pro  Guides, News, & Discussion] Danny1976:
Can't believe C.21 is still on the May security update.
[OnePlus 8 Pro  Guides, News, & Discussion] memocatcher:
So I'm currently running OOS 11.0.11.11 .In11BA and tried to upgrade to Android 12 with Oxygen Updater and Local Update today.

First, I tried to flash IN2023_11_C.21 (full zip) through the Local Upgrade setting, it installed without errors and then I rebooted.

Though, I was still on the same Build Version and Android 11. Nothing changed.

After that I tried flashing an earlier build (IN2023_11_C.16, also full zip) but it was the same. Nothing changed after the reboot and I was still on Android 11.

It's very weird right? Am I doing something wrong?

Thanks for any help!
[OnePlus 8 Pro  Guides, News, & Discussion] memocatcher:
Who got an mirror for IN2023_11_C.15? Full zip