yashsingh1/xdaforums huggingface dataset:
[OnePlus 12R / OnePlus Ace 3] sabpprook:
no, without doing backup first, there's nothing you can do.
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
Did you flash oplusstanvbk too?
[OnePlus 12R / OnePlus Ace 3] sabpprook:
Yes, I flash oplusstanvbk and modem to get cellular signal work again after CPH2585 14.0.0.500 OTA update.

And I restore my original OCDT file to get bootloader access back.
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
so the ocdt files are unique to each phone ?
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
I think you have to start fresh again. EDL Ace 3 firmware. Recover signal.

And then flash 12R Global package fastboot that post jookean.

I did that steps and no problem.

And if you have to ota, like i said, full package download, local update, and flash oplusstanvbk
[OnePlus 12R / OnePlus Ace 3] sabpprook:
It work fine now, with CPH2585 500 full OTA update and PJE110 317 oplusstanvbk, modem.
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
Very good!! I think that the fastboot package that upload jookean didnt flash de ocdt. And if this is right i can backup my ocdt
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
Do the steps that put before. Download full ota, not incremental with oxygen updater.

Do the local update

Phone boot ups with wifi signal but no cellphone signal

And flash the oplusstanvbk that share jookean.

Enjoy
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Tried that already but my problem is that I don't have access to the bootloader anymore (didn't backup my original ocdt file)and right now I'm unable to OTA manually from neither oxygen updater nor the stock update app and I can't change these unlock status since they can't be changed from fastbootD mode (I can't access the regular fastboot/bootloader mode)
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
What method did you use to convert to oos and lost the ocdt?
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Well I switched back and forth between the two using first @Jookean method then the flash tool and lastly flashing the img files through fastbootD mode (I also went back and forth between these methods)
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
Shame man. Did you tried to flash ocdt that shares from ace 3?
[OnePlus 12R / OnePlus Ace 3] sabpprook:
You can try to flash someone's PJE110 ocdt.img through fastbootD then run MSM download tool to flash OFP for PJE110 and then flash CPH2585 images through fastbootD with my bat script, after that please do factory reset in fastbootD mode/menu.
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Yeah multiple times
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
I'm currently on Color OS, cellular network and WiFi are working so can I run your script right away ?

PS : I noticed on the bat script that the .img files don't correspond with the ones I got from this thread could you give me a link to that specific ROM ?
[OnePlus 12R / OnePlus Ace 3] 954wrecker:
Can we switch from oxygen to color on a North American OnePlus 12R?
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
From what I read here it looks like the Ace 3 model even has a hardware part ( pixelworks x7 chip ) that is seemingly absent in the 12R version so I don't know about that maybe it's possible but it might be risky
[OnePlus 12R / OnePlus Ace 3] 954wrecker:
I'm so upset with this 12R it's the biggest POS phone I've ever purchased.
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Yeah it's absurd and what's even more annoying is the price difference. I just checked today on a french site, you can get a chinese OP12 at 24GB/1TB for the same price as the 12GB/256GB global version. same thing goes for the Ace3/12R I got mine (chinese) with 16GB/512GB at around 500$
[OnePlus 12R / OnePlus Ace 3] sabpprook:
CPH2611export_11_14.0.0.307EX01_2024012713400107.zip

drive.google.com

extract and put the bat script into it
[OnePlus 12R / OnePlus Ace 3] IkySora:
hey bro, I found this app from same develop but is older version, this version is 1.1, I try to login like above and successfully, but my 12R is delivering, so I can't operate.

Do you want to use older version to flash?
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Same as last time can't OTA
[OnePlus 12R / OnePlus Ace 3] Advali:
Yes, I basically used the new method that Jookean posted to restore mine back to stock so OTA works without any issues.
[OnePlus 12R / OnePlus Ace 3] chemicalboyxda:
Ota works but with unlocked bootloader right?
[OnePlus 12R / OnePlus Ace 3] avid_droid:
the tool just says success after opening? There is no way of actually getting into anything from it.

My phone also says when booting that recovery has been destroyed. It's a hard brick
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
is it showing a red text that says it will turn off after 55 seconds ?
[OnePlus 12R / OnePlus Ace 3] avid_droid:
Nope. It says "Error" on top of little window with "SUCCESS" and a OK button. Then it does nothing
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Try this one then it sets up the bypass method without having to use a second machine ans you can also use it on other versions of the flash tool as long as you add it on proxifier

Unbrick Oneplus Open using Official Flash Tool 5.6.6 in EDL mode.

Original Credits: THREAD, User: @oppo_edl_hacker for pythong script, @softhive for script. CLICK HERE TO MESSAGE ME -- For Support Related Queries. Hardware Requirements: 1. WIndows Machine 2. OnePlus Open Phone Software Requirements: Download...

xdaforums.com
[OnePlus 12R / OnePlus Ace 3] Zakaria11Yo:
I tried all of it worked until 49% saying sparse file missing and now my phone wont turn on.
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Maybe the files are corrupted
[OnePlus 12R / OnePlus Ace 3] presheaves:
Complete new beginner here, never flashed nor rooted my phone before, can someone explain the terms used in flashing? What is a "OFP Folder"?

Since I don't any file extension that is OFP appears in the ROM. The tools provided from OP can't be used from those official ROMS.

Also, suppose I want to convert my ACE 3 from Color to Oxygen which matching my system, which rom should I choose, the one exactly fit the current system (OFP_ColorOS_PJE110_14.0.0.309(CN01) A.52) or the one I want to convert (Oxygen OS CPH2585_14.0.0.307(EX01) )?
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
the most important thing I can tell you is to look up how to backup your original ocdt.img (it's a file in your original ROM) anything else you can learn by trying without having to worry too much (except if you don't want to lose personal data that you have on your phone now) I was a total beginner too and that ocdt mistake is the only thing I can't recover from (for now hopefully)
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
Anyone else managed to take the game engine from Ace3 and put it onto a converted 12R to use the 120hz frame booster? Was thinking of just taking the APK file of the game engine from CN and installing it onto Global to try but I do not want to reset my phone just yet
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
the 12R seems to not have the chip that allows to perform that frame boost
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
Im talking about a converted ace3 running OOS. Any ideas on how to port that feature from colorOS to OOS?
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Oh my bad didn't read your question well. You can try installing that apk like you said
[OnePlus 12R / OnePlus Ace 3] presheaves:
Thank you but I still don't get how to find the OFP folder, and which ROM should I use (The one matches my current system, i.e, PJE110 with Color OS, or the one I want to convert, CPH2609/OxygenOS? Do I have to root the system before flashing?
[OnePlus 12R / OnePlus Ace 3] Zakaria11Yo:
I DO

I DONT KNOW HOW I CAN THANK YOU! my phone has been dead for 3 days i came here and this legend is just the best.
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
You don't find it you can download it from the links given on the first page of this thread, for the ROM you should use the CPH2609 but before that like I told you you need to backup the ocdt file of your original ROM and in order to do that I think you have to root your phone (someone explained how to do this backup thing just check the previous posts of this thread) but before flashing the CPH2609 package you need to flash the ocdt file of the global version (again you'll find it in previous posts on this thread) and then you'll use the tool given on the first page to flash the CPH2609 OFP package (all given on the first post)
[OnePlus 12R / OnePlus Ace 3] AboAnas25:
Can I relock bootloader after conversion to global rom?
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
hi

can anyone tell me if i flash cdt from 12R and after that relock bootloader i will receive OTA update normal

and i don't need flash cdt again ?
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
hi guys

i converted my phone to global and i get update ,after updated i noted phone not have signal .

i flashed oplusstanvbk but only one sim card is work .

there is anything i can do for 2 sim card
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
hi

please you can make for new update or Explain how we can do with new update
[OnePlus 12R / OnePlus Ace 3] Advali:
It takes awhile actually. Same thing happened with mine and the only available slot with signal initially was SIM 2 slot. I removed my SIM and switched my SIM 1 sim to SIM 2 slot, after the sim has been read by both slots, I just insert the second SIM to slot 1 and now both works.
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
After several attempts my phone hardbrick ,fastboot and recovery not available .

i try flash firmware by edl but its stopped at 3%.(i used old and new method but not work )

can anyone help me
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
you did not use the correct OCDT for the software version you want to flash. Did you try to flash OxygenOS? If yes and it failed, return to ColorOS first before continuing.
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
i used Generator ocdt from this link

[Ace 3] Convert OCDT 23801 to 23861 (Ace3 to 12R)

This OCDT is converted from the device's original OCDT, so it will still use the bootloader normally like the original OCDT. Extract the OCDT from Ace 3. Access https://vnncv.io/ocdt/23861.html. Choose the extracted OCDT file and select...

xdaforums.com

after that i flash twrp and root for writing wifi fix method after that the phone is hardbrick .

i try OxygenOS and color os but not work.

i have the original ocdt
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
Not sure what went wrong there, but you can try reflashing colorOS first using the MSM tool and see what happens
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
i can't access to fastboot for flash ocdt ,edl only is available
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
i try but the process is stopped at 3%
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
what does the error message say
[OnePlus 12R / OnePlus Ace 3] IkySora:
I get my ace 3 genshin impact edition, and I found the version number release is PJE110_14.0.0.320.

This is mean that i must flash to 305 by old method before if i want to flash to global rom?
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
try using the old method instead
[OnePlus 12R / OnePlus Ace 3] FrenchFryKid:
you did not use proxifier and mitmproxy
[OnePlus 12R / OnePlus Ace 3] mr.mgmg:
i used
[OnePlus 12R / OnePlus Ace 3] Jookean:
6. Enable NV Default?
[OnePlus 12R / OnePlus Ace 3] thang97:
DO NOT FLASH TO OLDER THAN 320 ON GENSHIN EDITION

You will lose the custom boot animation and themes until someone gets their hand on Genshin EDLs
[OnePlus 12R / OnePlus Ace 3] Cameron Lowry:
Hey all! Can this be used to fix bootlooping to black screen when trying to kernel flash kernelsu?
[OnePlus 12R / OnePlus Ace 3] ndauch:
Hi Jook!

I have the PJE110 model, i'd like to convert to OxygenOS as well

and regarding step 6 of your guide, which OFP/where can i find OFP suitable to drag to the tool please?
[OnePlus 12R / OnePlus Ace 3] 123Johnny123:
I have the oneplus ace 3. which is model pje110 the coloros chinese version is installed. i really would prefer the oxygenos is this possible, there are just informations for unbricking this model and it seems the 12r rom wont work on the Ace 3. can anyone point me to a link so i can learn more..
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Read this whole thread and you'll know everything you need to know.

But fyi I tried both and Oxygen OS consumes the battery faster and doesn't have certain options of FPS enhancements because the Ace 3 has a visual processing chip that the 12R doesn't seem to have https://www.reddit.com/r/oneplus/s/U6l9LgBIha
[OnePlus 12R / OnePlus Ace 3] thang97:
The Ace 3 has a dedicated display processor. However it's not Pixelwork X7 like the Realme GT5 / GT5 Pro, it's a brand new in-house Oppo P1 chip

That said, it only enables certain image options and frame generations on a handful of Chinese mobile games download from their store only, so you aren't missing out too much with a 12R rom
[OnePlus 12R / OnePlus Ace 3] gentrydeng:
It's actually a Pixelworks X7 Gen 2: https://www.pixelworks.com/media/2024/01/04/press/3582/
[OnePlus 12R / OnePlus Ace 3] Yacine9258:
Maybe I phrased it wrong but it definitely does have it, I used the adaptive frame boost option on cod mobile with ultra settings and I was able to get steady 120fps for quite some time without heating issues
[OnePlus 12R / OnePlus Ace 3] volcksonia:
I have an Ace 3 Genshin Impact Edition. I converted it to CHP2609 using the old method without backup my ocdt. I get an ocdt backup of the same version phone from one of the forum user. Do I still have chance to get bootloader back?
[OnePlus 12R / OnePlus Ace 3] Advali:
^I think its a No since each phone's OCDT is unique. I've talked to some users as well that didn't backed up their OCDT and til now, they still don't have bootloader access even after testing other user's OCDT. But who knows, there might be a way to fix this.
[OnePlus 12R / OnePlus Ace 3] Laolee:
Greetings everyone,

As a newcomer to this community, I'm going to convert my OnePlus ACE 3 into a OnePlus 12R.

After carefully reviewing discussions in this thread, I've outlined the steps I plan to follow:

1. Root my phone first.

I found a comprehensive guide tailored specifically for the OnePlus 12R:

[https://xdaforums.com/t/how-to-root-oneplus-12r-a-complete-guide.4663162/].

My questions are,

A. Can I do exactly those steps on ACE 3?

B. Should I do all the steps to root or just need to unlock the bootloader?

2. Back up my original OCDT.

Spoiler content hidden.

My question is,

What does the persist.img do? I didn't find any use of the following steps.

3. Employ the "Old Method".

Spoiler content hidden.

4. Reflash back my original OCDT.

Spoiler content hidden.

My questions are,

A. Where does the oplustanvbk come from?

B. How can I get it?

C. Is it related to the file persist.img from the first step?

==========================================

Thanks to anyone who can help me out.
[OnePlus 12R / OnePlus Ace 3] xperiazu21:
1. You need root privileges to back up OCDT. However, to obtain root privileges, you need to unlock the bootloader.

2. I think backing up persist.img is just in case. I didn't use it when converting either.

3. You can back up oplustanvbk from colorOS first, or obtain it from the update package of colorOS.

Just to convert Ace 3 to 12R, I recommend using the archives provided by Jookean in steps 3 and 4, very easy and safe.
[OnePlus 12R / OnePlus Ace 3] LS²:
Hello,

New member. My wife just bought the Genshin Impact edition off eBay. Fortunately it was a global edition as the mobil and wifi work. Unfortunately, the OS is Color OS and has a lot of Chinese apps installed. She would like to convert to OOS to remove the Chinese stuff. Has anyone done a step by step for genshin version specifically, as I have never attempted anything like this. Thanks in advanced for your time.
[OnePlus 12R / OnePlus Ace 3] farukomerkurt:
Hello,My phone model is ACE 3 PJE110

I was stuck in edl mode due to incorrect installation.

No matter what I did since last night, I couldn't get the phone out of brick mode. I tried all versions of flash tools.

can you please help? How can i get rid of this?

I'm getting these errors:
[OnePlus 12R / OnePlus Ace 3] Oswald Boelcke:
Hello and good afternoon, @Advali

I've edited your post and removed the link to a paid services website that are not allowed by rule no. 13 of the forum rules. In future, please refrain from sharing such websites. Thanks for your cooperation.

Regards

Oswald Boelcke

Senior Moderator
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
PM me
[OnePlus 12R / OnePlus Ace 3] RAFAEL1509:
Hello friends, yesterday I bought the Ace 3 on Aliexpress, the seller told me that he will open my package to be able to unlock my Ace 3 so that I can use it outside of China and that I do not receive the message that it will be blocked in 15 days by OnePlus. I have some doubts regarding the team. I asked the seller to leave me the Chinese stock rom.

1.- Is it worth making the change from ColorOs to OxigenOs?

2.- What risks do I run when doing this ROM change?

3.- Do you really gain something from the language?

Greetings :)
[OnePlus 12R / OnePlus Ace 3] mArIuS%:
There are some sellers on AliExpress witch can flash the OOS so you can use the phone outside China region. The risks are pretty big if you are a novice in unlock bootloader, root, backup all important partitions and flashing new rom, as you can see there are some people witch messed up they're devices by trying fo migrate from cos to OOS, basically on OOS you have all languages not only Chinese and English and google applications are not restricted, regarding to the interface i don't believe there are some major changes.

If i was in your place, i would accept the chinese seller to flash the international OOS, oh just don't forget if they will send you the device with COS you won't be able to use a Sim card outside China so you will have to do this hard work.

Good luck!
[OnePlus 12R / OnePlus Ace 3] sarfarazbhat:
My model is CPH2585(OnePlus 12r)and I flashed the pixel os by inferno recently ,I want to revert back to stock oxygen OS 14 , will this msm method work?
[OnePlus 12R / OnePlus Ace 3] Uomocina:
Hi, where i can get the msm tool for the old method?
[OnePlus 12R / OnePlus Ace 3] ilia3367:
I'm asking for help!

Converted Ace 3 to 12R using this method https://xdaforums.com/t/ace-3-to-12r-how-i-converted-my-oneplus-ace-3-to-12r.4663519/

Everything installed fine, but SIM is constantly dropping out, no connection, WiFi was working. I decided to go back to ColorOS using the method described in this thread.

But I didn't flash the original ocdt.img, but I still have ocdt_23861.img. Could this be the reason why I'm having problems now?

I am trying to restore the system with the firmware PJE110domestic_11_14.0.0.0.305CN01_2023122613020116.

I replaced the prog_firehose_ddr.elf file with the corrected one from the attached archive.

The flashing process is interrupted as shown on the screenshot.

If you stop the process, a black screen with a red message appears.

I apologize for perhaps not properly stating the problem. I am writing with the help of a translator.

I will be glad to have any help!
[OnePlus 12R / OnePlus Ace 3] thang97:
Flash oxygenos ofp files,you already flashed the oos ocdt so cos will not be compatible
[OnePlus 12R / OnePlus Ace 3] ilia3367:
How do I do that? Phone does not boot to fastboot
[OnePlus 12R / OnePlus Ace 3] thang97:
The same way you do the coloros edl, but with oxygenos ofp files
[OnePlus 12R / OnePlus Ace 3] ilia3367:
I don't have the EDL firmware for the CPH2585....
[OnePlus 12R / OnePlus Ace 3] thang97:
2611 or 2609 is okay
[OnePlus 12R / OnePlus Ace 3] ilia3367:
This firmware CPH2611export_11_14.0.0.0.307EX01_2024012713400107 also has an error on it
[OnePlus 12R / OnePlus Ace 3] thang97:
Use old conversion method
[OnePlus 12R / OnePlus Ace 3] ilia3367:
Will it fit from here? https://xdaforums.com/t/unbrick-oneplus-open-using-official-flash-tool-5-6-6-in-edl-mode.4651747/

I just don't see the right files in this thread. Or I'm completely blind after a sleepless night
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
So you lost fastboot..?
[OnePlus 12R / OnePlus Ace 3] mvikrant97:
This is due to the ocdt.img not matching which is used to identify the device project code in the tool.
[OnePlus 12R / OnePlus Ace 3] ilia3367:
Is there anything we can do?
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
you should be able to get to edl ..I been there here ..lol ...can edl back to ColorOs..but still need your ocdt.img
[OnePlus 12R / OnePlus Ace 3] ilia3367:
I can log into the EDL
[OnePlus 12R / OnePlus Ace 3] ilia3367:
I saved the original
[OnePlus 12R / OnePlus Ace 3] mvikrant97:
You have the original ocdt?
[OnePlus 12R / OnePlus Ace 3] ilia3367:
Yes
[OnePlus 12R / OnePlus Ace 3] mvikrant97:
Your problem has been solved! Congratulations.
[OnePlus 12R / OnePlus Ace 3] ilia3367:
You are a great master! Thank you so much!
[OnePlus 12R / OnePlus Ace 3] etajv100:
after installing the VC redist and 9008, i tried running the flash tool, but it just would not run, not sure why...

Instead of trying to fix the issue, i grabbed another computer fresh install windows 11 and started from scratch, now i was able to run the flash tool, installed the driver (two of them)...

now when i boot to fastboot, the computer recognize the phone as "Android Bootloader Interface" all is fine, the issue is that the tool does nothing...

i opened it followed all steps changed the "Prog_firehgose_ddr.elf" but when i click start nothing really change, i just get "STOP" instead of start but it's stuck there...

PS i have an ace 3 tried converting to 12R using this thread https://xdaforums.com/t/ace-3-to-12r-how-i-converted-my-oneplus-ace-3-to-12r.4663519/

the issue is that i skipped the first step "1. Flash your Ace 3 back to 14.0.0.305CN01 Firmware using the ff firmware below and the new method from Thread 1. Just follow the steps and don't forget to overwrite the prog_firehose_ddr.elf under <Firmwarefolder>/IMAGES (from the downloaded firmware file below once you've extracted it:) All the files needed are already in that thread."

and flashed the "ONEPLUS_ACE3_PJE110_TO_CPH2585.rar "now the phone boot loop, but i still have access to Fastboot, and i can acess recovery through Fastboot, i'm just stuck with no idea how to move forward.

ps OCDT is backed up...

i hope someone can help me with this....
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
You need to be in EDL. not fastboot . Leave loader running ..unplug phone ... Hold in all three button ( phone will go black ) plug into computer while holding in buttons should show up in device manager ,,,under ports and loader should kick in
[OnePlus 12R / OnePlus Ace 3] etajv100:
no help
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
edl...restart loader ..try
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
you got color os in loader..you trying to flash back to color os
[OnePlus 12R / OnePlus Ace 3] etajv100:
how to execute that?, my folder only have adb and fastboot
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
Hit stop on loader and all ready have phone in edl ...hit start
[OnePlus 12R / OnePlus Ace 3] etajv100:
flash tool is already on stop didn't start anything, and it's not detecting the phone
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
When you see stop on loader ..that means hit to stop flashing...when you see start on loader that means hit to start

Loader / flash tool
[OnePlus 12R / OnePlus Ace 3] etajv100:
Okay looks like it's working now, after it finishes what step should i follow to finish converting my phone to 12r?

[Ace 3 to 12R] How I converted my Oneplus Ace 3 to 12R

First of, I know that there might be post/comments in this Oneplus 12R forum already on how other users have managed to convert their Ace 3 to 12R. Some have managed to flash to 12R but without a working signal or WiFi. Others flashed the ColorOS...

xdaforums.com

i have backed up ocdt file, and generated a new one...

i appreciate your help so thank you very much.
[OnePlus 12R / OnePlus Ace 3] Canuck Knarf:
what you trying to do..? dont flash ocdt yet ...explain to me what you want to do...I will walk you threw it
[OnePlus 12R / OnePlus Ace 3] etajv100:
i'm trying to convert from color os to oxygen...