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how can i switch from Hydrogen 5.1.11 to Oxygen 5.1.9?

I bought a Oneplus6 in China and updated it to the latest version of h2os which is 5.1.11.
Just wondering how i can switch this to Oxygen 5.1.9? I did some searching online but couldn't find a clear guide that i could understand. Do i need to wait until the latest Oxygen version is newer than the h2os version? I read that downgrading is not possible.
appreciate any help!

Lanky09 said:
I bought a Oneplus6 in China and updated it to the latest version of h2os which is 5.1.11.
Just wondering how i can switch this to Oxygen 5.1.9? I did some searching online but couldn't find a clear guide that i could understand. Do i need to wait until the latest Oxygen version is newer than the h2os version? I read that downgrading is not possible.
appreciate any help!
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You should be able to just flash a full zip of the latest oxygen (there is a thread in the forum for it) via twrp, flashing the fullzip will completely overwrite your system so its ok.
But why do you want to switch? Hydrogen is like a Beta for Oxygen, they are testing the new features on hydrogen first

https://www.youtube.com/watch?v=3fU6lfkQz2c i just found this video, would that work? could you send a link for the thread ?
i need google apps
thanks a lot for your help!

[OFFICIAL] HydrogenOS 9.0 Stable Full OTA for the OnePlus 6

Hours ago OnePlus released the stable hydrogen OS.
Download Link:
https://drive.google.com/open?id=1vDVE1HJinuSTNCNyBP__GgiFVNqu6ClI

hussein1 said:
Hours ago OnePlus released the stable hydrogen OS.
Download Link:
https://drive.google.com/open?id=1vDVE1HJinuSTNCNyBP__GgiFVNqu6ClI
Click to expand...
Click to collapse
Any performance difference from pie? Thanks!

Thanks for sharing, i was trying to download from Baidu it was very slow.

Thx for sharing, anayone tested it? is the camera app better than OOS? did they improve it or is it still the same?(painting effect, burned colors, blurry...)

is it the latest update of H2OS?...after beta 7 ? if YES...i am beta 7..how do i flash clean or dirty ? [ bootloader unlocked no root ]

VeNoM141 said:
is it the latest update of H2OS?...after beta 7 ? if YES...i am beta 7..how do i flash clean or dirty ? [ bootloader unlocked no root ]
Click to expand...
Click to collapse
By local update

my GPS is on but i cannot locate in many apps (Weather, Grab)..is it a bug or just me? how to fix it?

Thinking about installing this Rom but wondering how it's behaving on French networks (LTE) ?

Wondering... HydrogenOS is Gapps free. What i'm looking for. But does he have signature spoofing for being able to use microG ?

hussein1 said:
Hours ago OnePlus released the stable hydrogen OS.
Download Link:
https://drive.google.com/open?id=1vDVE1HJinuSTNCNyBP__GgiFVNqu6ClI
Click to expand...
Click to collapse
Does it require root? Sorry for noobish question, or need to unlock bootloader.

Is there anyone on hydrogenos? I would like to use h2launcher on oxygenos

original os version installed in op6?

Hi friends, i w'd like to know wht oxygen version came in op6 at the time of unboxing..? I want to revert to it..

Mine Came with Oreo.

Nish53 said:
Mine Came with Oreo.
Click to expand...
Click to collapse
I want oxygen os version..

Mine with Milka...
Oxygen 5.1.5

5.1.5 - was by far least buggy version.

Could be 5.1.3, but the first was 5.1.0

Rebrand op7 Pro from hydrogen os to oxygen os. Downgrading not allowed.

Hello so I got a op7 Pro from china and it has got hydrogenOs. I saw a lot of guides where they tell you to use the local upgrade to install oxygen os. But the problem is that the hydrogen os on this device is the latest version. Whereas the oxygen one on the oneplus 7 pro site is not. So when I try this method it tells me that downgrading is not allowed. I know I can wait for oneplus to update the download link so I can install that one instead but I am wondering if there is another way. Just flash a stock version?

Saif80 said:
Hello so I got a op7 Pro from china and it has got hydrogenOs. I saw a lot of guides where they tell you to use the local upgrade to install oxygen os. But the problem is that the hydrogen os on this device is the latest version. Whereas the oxygen one on the oneplus 7 pro site is not. So when I try this method it tells me that downgrading is not allowed. I know I can wait for oneplus to update the download link so I can install that one instead but I am wondering if there is another way. Just flash a stock version?
Click to expand...
Click to collapse
Try this link
https://forum.xda-developers.com/oneplus-7-pro/help/how-to-convert-tmobile-op7-to-t3935947

Full 11.0.10.10.IN21AA and not OTA

Hello everyone when 11.0.10.10 was released the Global full ROM was not released for some reason, Does anybody have a link for it?
[Update: OnePlus 8T too] OnePlus 8, 8 Pro, and Nord 2 receive new OxygenOS updates with December 2021 security patches
OnePlus has started delivering the December 2021 Android security patches to the OnePlus 8, 8 Pro, and the Nord 2 with new OxygenOS updates.
www.xda-developers.com
I wanted to do a full wipe with a clean rom install
Thanks

@infected_ Has a good one
[ROM][STOCK IN2011_11_C.21][FASTBOOT] Easily return method to OOS from custom ROMs or simply reflash OOS
Oneplus 8 Fastboot ROMs DOWNLOADS: https://www.androidfilehost.com/?w=files&flid=326825 Mirror: Current version: IN2011_11_C.21_202205172355 PASSWORD: XDA2021 or XDA2022 (newest files)
forum.xda-developers.com

FoxyDrew said:
@infected_ Has a good one
[ROM][STOCK IN2011_11_C.21][FASTBOOT] Easily return method to OOS from custom ROMs or simply reflash OOS
Oneplus 8 Fastboot ROMs DOWNLOADS: https://www.androidfilehost.com/?w=files&flid=326825 Mirror: Current version: IN2011_11_C.21_202205172355 PASSWORD: XDA2021 or XDA2022 (newest files)
forum.xda-developers.com
Click to expand...
Click to collapse
Thanks a lot, but this is the EU one and not the Global version.
+ Do you know if I can get a normal rom to just flash from local upgrade and call it a day?
Thanks
EDIT: Sorry for missing this info, its a UW8 that was converted to global which infected's rom wont work with.

Get Oxygen Updater from the play store. You can download it in the app.

5cardcharlie said:
Get Oxygen Updater from the play store. You can download it in the app.
Click to expand...
Click to collapse
Tried that, wont allow me to download the full update only OTA for some reason

You can change the update method in the settings of the app, or get the rom from here:
[OnePlus 8][ROM][OTA][Oxygen OS] Repo of Oxygen OS Builds
As OnePlus doesn't always provide download links for all of their OxygenOS ROMs & OTA update zips, we've created an index to put the links in one post so that they're easy to find. Note: This is not a support thread for issues you may have with...
forum.xda-developers.com

5cardcharlie said:
You can change the update method in the settings of the app, or get the rom from here:
[OnePlus 8][ROM][OTA][Oxygen OS] Repo of Oxygen OS Builds
As OnePlus doesn't always provide download links for all of their OxygenOS ROMs & OTA update zips, we've created an index to put the links in one post so that they're easy to find. Note: This is not a support thread for issues you may have with...
forum.xda-developers.com
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Click to collapse
Yea, I know I can change it from the settings to download the full rom but weirdly it didn't work.
Thanks a lot for the link

awsan said:
Thanks a lot, but this is the EU one and not the Global version.
+ Do you know if I can get a normal rom to just flash from local upgrade and call it a day?
Thanks
EDIT: Sorry for missing this info, its a UW8 that was converted to global which infected's rom wont work with.
Click to expand...
Click to collapse
ill make you one fastboot from the latest Global.
regards.

infected_ said:
ill make you one fastboot from the latest Global.
regards.
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Click to collapse
Please share when you do