[OnePlus 10 Pro] Loba74:
Short description for "How to switch from ColorOS (Chinese version) to OxygenOS (IND/EU) on OnePlus 10 Pro". I did the flash under Windows 10, even if I'm usually a Linux guy...

BEFORE DOING THIS MANUAL, MAKE A BACKUP OF THE DATA OF YOUR DEVICE! Your phone will be DELETED completely!

1.)

- Download the desired ROM (Oxygen OS 12.1 A11 (IND) or Oxygen OS 12.1 A12 (EU) (Auntie Google has the answer, effective April 2022) -> extract

- download OnePlus_USB_driver.zip:

https://oneplususbdrivers.com/download-oneplus-usb-driver/ -> extract

- download Android Platform SDK:

https://www.techspot.com/downloads/downloadnow/5425/?evp=de0a68064118855fcddcc3980a2143c4&file=6062 -> extract

- download "Fastboot Enhance Tool": https://xdaforums.com/t/tool-windows-fastboot-enhance-payload-dumper-image-flasher.4310553/ -> extract

2.) First of all, disable driver signature check for Windows 10, because the OnePlus drivers are not signed (yet).

3.) After restarting Windows, install the OnePlus drivers by executing the .exe file from the extracted folder.

4.) Copy the payload.bin file from the downloaded ROM into the folder where the fastbootenhance tool is located

5.) Enable Developer Options on your phone

6.) Enter the Developer Options, enable OEM unlock and USB debugging there

7.) Now connect your OnePlus 10 Pro to your computer by a USB cable. Make sure it's started, screen unlocked and charged over 60%

8.) On your computer, open File Explorer and switch to the Android SDK folder. Click in the address line above and type CMD [Enter]. A CMD window opens in the SDK folder.

9.) In CMD, type "adb devices". A new line should appear with the encrypted name of your device. When an empty line is returned, check the driver installation. If this line returns the name, but the suffix "not allowed", you must first allow this connection ON YOUR PHONE. Disconnect and reconnect your device and confirm the popup that appears on your phone! (Best is to enable "Always allow connections from this computer"!)

10.) Now type "adb reboot bootloader" in CMD. Your telephone restarts automatically to bootloader mode. In this mode your phone should tshow you it's name and beside of some other information you don't need, that the bootloader is LOCKED.

11.) Type in CMD "adb flashing unlock [Enter]". Now your phone should restart and ask you, if you want to unlock the bootloader or do not unlock the bootloader. With the volume buttons, switch to "UNLOCK BOOTLOADER" and confirm by pressing the Power Button.

12.) After doing so, restart your phone. After rebooting, go back to CMD and type "adb reboot fastboot". Your phone now should restart to "FASTBOOTD MODE". You are asked to choose a language (I recommend english after all... ;-) )

13.) Open the "Device Manager" on your computer.

14.) If device manager shows you some unknown device like "Android: ! 'ossi'" or similar, your device is not recognized in fastbootd mode. In that case continue with pt. 15. Otherwise continue with pt. 19

15.) Right-click on the unknown Android device and choose "Update driver..." -> "Search my computer for drivers" -> "Pick from a list of available drivers on my computer"

16.) When OnePlus drivers where installed correctly some steps above, Device Manager should suggest you 3 different possible drivers. Choose "OnePlus ADB Interface Manager" and confirm your choice. Windows will warn you that a wrong choice will crash Windows. Confirm also this warning.

17.) If everything went good, the before unknown device will change to an Android ADB Interface Device. When that happend, everything is good and you're good to go on.

18.) Just to be really sure: Type in CMD again "fastboot devices" and your computer should tell you the s/n of your phone with the suffix "fastboot". This will tell you your device is recognized in fastboot mode.

19.) Start "FASTBOOTENHANCE" tool from the respective folder (Folder name "release")

20.) Now you can follow the instructiions here at pt. 8.:

How to Install Indian ROM on Chinese OnePlus 10 Pro

In this comprehensive tutorial, we will show you the detailed steps to install the Indian ROM on the Chinese OnePlus 10 Pro.

www.droidwin.com

Puuuuuuh! That was enoying..! Maybe I have missed something... If so, please tell me by PN and I will complement this manual. But at this time, I guess it should work. I did it right like that this day - and it works fine! Finally I have my foremost chinese OP10Pro with a EU ROM in (swiss) german!

And if it works just like that (after my manual), please let me know as well!

Have fun! Oliver

Oh, there's something I forgot: I had after flashing still about a dozen of chinese apps I had to delete manually. Don't be surprised by that!