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Re-install Oxygen OS on Oneplus 9

  1. Giombo
    Donut Dec 3, 2021


    #1
  2. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    No, that is old data. Is your phone on Chinese ColorOS.?

    If so, and you wish to put OOS on it, be aware that the Chinese version will have different Network bands for 4G and 5G than other regions, these will remain the same with OOS on the phone. And you may notice other issues at times with OOS from a different region on a Chinese phone.

    Please read all posts from the entire thread below to be sure you carry out the instructions correctly and choose the files for your Phone Model. You do this at your own RISK

    Guide to switching from OxygenOS to ColorOS or ColorOS to OxygenOS.
    https://www.getdroidtips.com/oneplus-9-pro-switch-coloro-soxygenos/
     

    #2
    Gor., Aaron2017, Bobbie63 and 2 others like this.
  3. Giombo
    Donut Dec 3, 2021

    Giombo , Dec 3, 2021 :
    Thanks a lot.
    How can I check if I have colour OS?
    I looked at the guide, the problem is that I don't have the gear for installing downloaded packages.. I attach screenshot.
     

    #3
    Caomhin likes this.
  4. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    Check your Build number, but your About Phone layout looks like Coloros
    1638523917147.jpg
     

    #4
  5. Giombo
    Donut Dec 3, 2021


    #5
  6. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    If you are not on OOS 12 Beta 3 then you have ColorOS Stable 12.
    Either way you would need to follow the steps as given in my original link above. Once OOS is installed, you will have to OTA update to the latest update, which is currently 11.2.9.9 Stable.
    Backup any data you have beforehand as switching OS will Wipe the phone.
     

    #6
  7. Giombo
    Donut Dec 3, 2021

    Giombo , Dec 3, 2021 :
    Okay, the only problem is: How can I install the downloaded package? I don't have the gear that let me select the package to install. I even tried with oxygen updater but it says that is not compatible, bc the coloros I believe
     

    #7
  8. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    There is no other way. You will need a PC/Laptop and the USB cable, as the software to switch will require that.
     

    #8
    Gor., Aaron2017, Bobbie63 and 2 others like this.
  9. Giombo
    Donut Dec 3, 2021

    Giombo , Dec 3, 2021 :
    Thanks a lot. Is there a guide step by step to install the OxygenOS by PC?
     

    #9
  10. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    You can try the steps as mentioned in the post I linked to, read the whole article though, just to be sure you have all of the required info.

    Or you can check XDA for OP 9 and see if there is more info there. Most of the info about altering phone states will be listed in threads here.
    https://forum.xda-developers.com/f/oneplus-9.12151/
     

    #10
    Gor., Aaron2017, Giombo and 1 other person like this.
  11. Giombo
    Donut Dec 3, 2021

    Giombo , Dec 3, 2021 :
    Thanks, I have one more question: must I necessarily unlock bootloader? or are there any other way to install oxygen os?
     

    #11
    Caomhin likes this.
  12. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    No, as far as I know, there is generally no need to unlock the bootloader, unless it mentions it in specific instructions that someone gives you. Usually only need to unlock the bootloader to root the phone and for most Custom OS ROM installs.
     

    #12
    Gor., Aaron2017 and Giombo like this.
  13. Giombo
    Donut Dec 3, 2021

    Giombo , Dec 3, 2021 :
    Ok, I try to create a thread on XDA.
    Thank you so much
     

    #13
    Caomhin likes this.
  14. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    You're welcome 👍
    But also do a search on there, it's possible someone may have already created a thread and got an answer.
     

    #14
    Gor. and Aaron2017 like this.
  15. Swejuggalo
    OnePlus 9 Series Expert Community Expert Dec 3, 2021


    #15
    Giombo likes this.
  16. Giombo
    Donut Dec 3, 2021


    #16
  17. Giombo
    Donut Dec 3, 2021


    #17
  18. Caomhin
    9 Series Expert, Participator of the Year Community Expert Dec 3, 2021

    Caomhin , via OnePlus 9 Pro , Dec 3, 2021 :
    Looks like you are on OOS 12 Beta 3 which may or may not be beta 3 as no one has stated it is. Some think it might be stable 12 others think it is Beta 3 as OnePlus have not come out and stated the fact as it was only released 2 days ago.

    When did you buy the phone and did it update after you bought it.?
     

    #18
    Gor. and Giombo like this.
  19. Swejuggalo
    OnePlus 9 Series Expert Community Expert Dec 3, 2021

    Swejuggalo , via OnePlus 9 Pro Stellar Black , Dec 3, 2021 :
    If it were on 12 the same day as you bought it it could have been on open beta at the time. This is the future Oxygen OS 12.
    If you were on 11 and you updated automatically to this it's a different story.

    If it's beta as most think it is you can rollback via the instructions here.
    https://forums.oneplus.com/threads/...-for-the-oneplus-9-and-oneplus-9-pro.1502946/
     

    #19
    Giombo likes this.
  20. Giombo
    Donut Dec 3, 2021

    Giombo , Dec 3, 2021 :
    I bought 2 weeks ago, but it already was android 12 with that version, yesterday a new update compared and I installed it. I asked the person who sold me the phone and he told that he only installed the beta version, but even oxygen update doesn't recognize as oxygenOS.
    I found this guide on XDA:
    https://forum.xda-developers.com/t/...stable-android-12-on-oneplus-9-9-pro.4367113/

    I tried to download the "local update application" but when I try to install the official version for Oneplus 9 it says that can't update to an older version.. So have I to do the downgrade? Where can I find the Downgrade version for my phone?
     

    #20