How To Guide OnePlus 9: How to switch between Color OS and Oxygen OS without unlocking the bootloader

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mlgmxyysd

Recognized Developer
The China variant of the OnePlus 9 series comes with Color OS instead of Hydrogen OS by default, which is not good news for geeks as Color OS has many limitations compared to Hydrogen OS. Recently, OnePlus has officially provided a way to switch between Color OS and Oxygen OS.

Please note that switching systems will clear all user data, so you better know what you're doing.

· Switch from Color OS to Oxygen OS

Download the downgrade package for the appropriate model and system and put it in the internal storage.

Installation steps: Settings - Software update - Settings (top right corner) - Select installation package - Select the previously downloaded downgrade package - Install now - Install now

If the Select installation package option is grayed out, it means that you now have a pending system update and you can choose to install or skip it.

To skip update: Settings - App management - App list - Menu (top right corner) - Show system - Software update - Storage usage - Clear data - OK - Disconnect all network connections

· Switching from Oxygen OS to Color OS
Download the downgrade package for the appropriate model and system and put it in the root directory of the internal storage.

Installation steps: Settings - System - System updates - Settings (top right corner) - Local upgrade - Select the previously downloaded downgrade package - CONFIRM

Just reboot your device after the installation is complete and have fun!

Downgrade packages:
Color OS for OnePlus 9
Oxygen OS for OnePlus 9
 

Bilhouse

Senior Member
Apr 14, 2011
427
65
The China variant of the OnePlus 9 series comes with Color OS instead of Hydrogen OS by default, which is not good news for geeks as Color OS has many limitations compared to Hydrogen OS. Recently, OnePlus has officially provided a way to switch between Color OS and Oxygen OS.

Please note that switching systems will clear all user data, so you better know what you're doing.

· Switch from Color OS to Oxygen OS

Download the downgrade package for the appropriate model and system and put it in the internal storage.

Installation steps: Settings - Software update - Settings (top right corner) - Select installation package - Select the previously downloaded downgrade package - Install now - Install now

If the Select installation package option is grayed out, it means that you now have a pending system update and you can choose to install or skip it.

To skip update: Settings - App management - App list - Menu (top right corner) - Show system - Software update - Storage usage - Clear data - OK - Disconnect all network connections

· Switching from Oxygen OS to Color OS
Download the downgrade package for the appropriate model and system and put it in the root directory of the internal storage.

Installation steps: Settings - System - System updates - Settings (top right corner) - Local upgrade - Select the previously downloaded downgrade package - CONFIRM

Just reboot your device after the installation is complete and have fun!

Downgrade packages:
Color OS for OnePlus 9
Oxygen OS for OnePlus 9

Can you please reupload the Color OS Downgrade package for OnePlus 9 Pro to Google Drive or MEGA for me. I want to move from Oxygen OS to Color OS.

I have tried for hours to download from the links you provided but I cant as I am not in China and it either requires Baidu, QQ or WeChat accounts with a Chinese mobile number.

Thank you!
 
Last edited:

mlgmxyysd

Recognized Developer
Can you please reupload the Color OS Downgrade package for OnePlus 9 Pro to Google Drive or MEGA for me. I want to move from Oxygen OS to Color OS.

I have tried for hours to download from the links you provided but I cant as I am not in China and it either requires Baidu, QQ or WeChat accounts with a Chinese mobile number.

Thank you!
I don’t have enough GDrive capacity, so I am uploading it to mega & androidfilehost. After uploading, the original message will be edited without notice.
 
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Reactions: Bilhouse

jaydenied

New member
Apr 7, 2021
2
1
OnePlus 9
I have the T-Mobile variant and the software update menu setup seems to be different.
There isn't an option to select a local file.

So sad,
 

Oneplus8

New member
Aug 22, 2020
2
0
Hey, thanks for this! Can you tell me if this works for the US unlocked variant and will updates be OTA?
 

driv5r1

Member
Nov 14, 2008
26
1
Switched from color os to oxygen os on my oneplus 9 chinese variant i know there is a problem with the imei
being wrong but im also getting a pop up saying nv backup warning any hellp would be appreciated.

 
Apr 21, 2021
7
0
Hi, brother.
Thanks for that info.
But can I change the ColorOs with OxygenOs(Global Version) in Oneplus 9r (Chinese Variant). I need to be sure. Cause, I don't want to spoil my money anyway. Can you please reply?

And downloading the OxygenOs from the official website, will it work?

Thank you very much,
Ihasan Iftekhar
 
Apr 21, 2021
7
0
The China variant of the OnePlus 9 series comes with Color OS instead of Hydrogen OS by default, which is not good news for geeks as Color OS has many limitations compared to Hydrogen OS. Recently, OnePlus has officially provided a way to switch between Color OS and Oxygen OS.

Please note that switching systems will clear all user data, so you better know what you're doing.

· Switch from Color OS to Oxygen OS

Download the downgrade package for the appropriate model and system and put it in the internal storage.

Installation steps: Settings - Software update - Settings (top right corner) - Select installation package - Select the previously downloaded downgrade package - Install now - Install now

If the Select installation package option is grayed out, it means that you now have a pending system update and you can choose to install or skip it.

To skip update: Settings - App management - App list - Menu (top right corner) - Show system - Software update - Storage usage - Clear data - OK - Disconnect all network connections

· Switching from Oxygen OS to Color OS
Download the downgrade package for the appropriate model and system and put it in the root directory of the internal storage.

Installation steps: Settings - System - System updates - Settings (top right corner) - Local upgrade - Select the previously downloaded downgrade package - CONFIRM

Just reboot your device after the installation is complete and have fun!

Downgrade packages:
Color OS for OnePlus 9
Oxygen OS for OnePlus 9

Hi, brother.
Thanks for that info.
But can I change the ColorOs with OxygenOs(Global Version) in Oneplus 9r (Chinese Variant). I need to be sure. Cause, I don't want to spoil my money anyway. Can you please reply?

And downloading the OxygenOs from the official website, will it work?

Thank you very much,
Ihasan Iftekhar
 

iSkyJIE

Senior Member
Apr 22, 2021
55
3
Hi, brother.
Thanks for that info.
But can I change the ColorOs with OxygenOs(Global Version) in Oneplus 9r (Chinese Variant). I need to be sure. Cause, I don't want to spoil my money anyway. Can you please reply?

And downloading the OxygenOs from the official website, will it work?

Thank you very much,
Ihasan Iftekhar
This is op9 not op9r
 
How can you tell whether you have Color OS or OxygenOS?
Screenshot_20210508-103027.jpg
 

MarukuV

Member
May 13, 2021
22
3
Switched from color os to oxygen os on my oneplus 9 chinese variant i know there is a problem with the imei
being wrong but im also getting a pop up saying nv backup warning any hellp would be appreciated.

same goes with 9 pro. i think its a Chinese lock for the model.. all Chinese oneplus 9 series seems affected by this.. you can also go to system settings,, about phone and see if the verification portion is clickable.. in my case its missing.. oneplus switch to color os seems to be the culprit in here.. if there are no hardware differences in all models.. why do such missing certifications and imei errors exist?
 

rdaltonjay

New member
May 15, 2021
4
0
The China variant of the OnePlus 9 series comes with Color OS instead of Hydrogen OS by default, which is not good news for geeks as Color OS has many limitations compared to Hydrogen OS. Recently, OnePlus has officially provided a way to switch between Color OS and Oxygen OS.

Please note that switching systems will clear all user data, so you better know what you're doing.

· Switch from Color OS to Oxygen OS

Download the downgrade package for the appropriate model and system and put it in the internal storage.

Installation steps: Settings - Software update - Settings (top right corner) - Select installation package - Select the previously downloaded downgrade package - Install now - Install now

If the Select installation package option is grayed out, it means that you now have a pending system update and you can choose to install or skip it.

To skip update: Settings - App management - App list - Menu (top right corner) - Show system - Software update - Storage usage - Clear data - OK - Disconnect all network connections

· Switching from Oxygen OS to Color OS
Download the downgrade package for the appropriate model and system and put it in the root directory of the internal storage.

Installation steps: Settings - System - System updates - Settings (top right corner) - Local upgrade - Select the previously downloaded downgrade package - CONFIRM

Just reboot your device after the installation is complete and have fun!

Downgrade packages:
Color OS for OnePlus 9
Oxygen OS for OnePlus 9
I bought a Oneplus 9 Chinese variant and I've successfully converted my Oneplus 9 Color OS to Oxygen OS thanks to this tutorial. However, there are issues that the Model LE2110 has.
First is it doesn't have 5G in the preferred network type on the Color OS it has this in the list. Second, the Verification is not clickable.

Is there any other ROM from Oneplus that can fix these issues? and is Indian ROM different from the Global? If yes, is it possible to convert my current version(Oxygen OS 11.2.5.5.LE25DA, Model: LE2110) to a Global one?
 

MarukuV

Member
May 13, 2021
22
3
I bought a Oneplus 9 Chinese variant and I've successfully converted my Oneplus 9 Color OS to Oxygen OS thanks to this tutorial. However, there are issues that the Model LE2110 has.
First is it doesn't have 5G in the preferred network type on the Color OS it has this in the list. Second, the Verification is not clickable.

Is there any other ROM from Oneplus that can fix these issues? and is Indian ROM different from the Global? If yes, is it possible to convert my current version(Oxygen OS 11.2.5.5.LE25DA, Model: LE2110) to a Global one?
what country are you from? seems a common problem with oneplus 9 series color os cn version when converting to oxygen os. maybe its a wrong move for oneplus to use oppo's os.. it would be better if they stick with hydrogen for the cn versions.. older series doesnt experience such error.. you have the nvbackupui warning too?
 

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    The China variant of the OnePlus 9 series comes with Color OS instead of Hydrogen OS by default, which is not good news for geeks as Color OS has many limitations compared to Hydrogen OS. Recently, OnePlus has officially provided a way to switch between Color OS and Oxygen OS.

    Please note that switching systems will clear all user data, so you better know what you're doing.

    · Switch from Color OS to Oxygen OS

    Download the downgrade package for the appropriate model and system and put it in the internal storage.

    Installation steps: Settings - Software update - Settings (top right corner) - Select installation package - Select the previously downloaded downgrade package - Install now - Install now

    If the Select installation package option is grayed out, it means that you now have a pending system update and you can choose to install or skip it.

    To skip update: Settings - App management - App list - Menu (top right corner) - Show system - Software update - Storage usage - Clear data - OK - Disconnect all network connections

    · Switching from Oxygen OS to Color OS
    Download the downgrade package for the appropriate model and system and put it in the root directory of the internal storage.

    Installation steps: Settings - System - System updates - Settings (top right corner) - Local upgrade - Select the previously downloaded downgrade package - CONFIRM

    Just reboot your device after the installation is complete and have fun!

    Downgrade packages:
    Color OS for OnePlus 9
    Oxygen OS for OnePlus 9
    1
    Can you please reupload the Color OS Downgrade package for OnePlus 9 Pro to Google Drive or MEGA for me. I want to move from Oxygen OS to Color OS.

    I have tried for hours to download from the links you provided but I cant as I am not in China and it either requires Baidu, QQ or WeChat accounts with a Chinese mobile number.

    Thank you!
    I don’t have enough GDrive capacity, so I am uploading it to mega & androidfilehost. After uploading, the original message will be edited without notice.
    1
    Does the chinese variant will get the all bands of global variant after switch to oxygen os?
    1
    How can you tell whether you have Color OS or OxygenOS?View attachment 5303297
    Based on your build number, it stated that it is Oxygen OS indian version.
    1
    It's not a deal breaker for me since we can manually get 5G from the dialer. However, the functionality is there but it somehow needs an update from Oneplus to add 5G from the preferred network. I really hope Oneplus would fix these issues.
    im hoping for that too and with the release of oneplus 9 here in ph.. i hope the fix should be on its way soon..