Now I could unlock the bootloader.
Windows 11 Pro didn't work.

But Linux Mint 21.3 Cinnamon works:
Open Terminal.
adb devices
adb reboot bootloader
fastboot oem unlock (works)

ubport installer worked.

Thank you for your help!

Along with the phone a driver OnePlus_USB_Drivers_Setup was delivered. I have also tested this driver. But it doesn't work.

Is it possible, the Windows 11 is the problem and it has to be Windows 10?

1. I have completely reset the windows 11 PC to it's original state and then installed all updates.
2. I have installed the Qualcomm USB driver v1.0.10065.1 on the PC
3. I have started the phone in fastboot mode and plugged in the USB-cable
4. Device Manager shows Android with exclamation mark
5. terminal: C:Users[user name]\ Desktop\platform-tools>asb version -> doesn't work
6. Installing MS Visual C++ 2012 Redistributable (x86) 11.0.61030
7. terminal: C:Users[user name]\ Desktop\platform-tools>asb version -> doesn't work
8. Restarting PC
9. Command: COM -> C:Users[user name]\ Desktop\platform-tools>asb version -> Android Debug Bridge version 1.0.41
10. adb devices -> List of devices attached -> no devices listed
11. adb reboot edl -> error: no devices/emulators found
12. Device Manager shows Android with exclamation mark

Phone - System - USB-configuration -> allow file transfer.

Now:
adb devices -> is found
fastboot devices -> no respond

Device Manager - right click - properties:
General
Device type: Other devices
Manufacturer: Unknown
Location: Port_#0004.Hub_00001
Device status
The drivers for this device are not installed. (Code 28)
There are no compatible drivers for this device.
To find a driver for this device, click Update Driver

Driver
Android
Driver Provider: Unknown
Driver Date: Not available
Driver Version: Not available
Digital Signer: Not digitally signed

Details
Property: Device description
Value: Android

Events
Timestamp Description
6/14/2025 ... Device configured (null)
6/28/2025 ... Device deleted
6/28/2025 ... Device configured (null)
Information
Device USB/VIC........... was configured.
Driver Name: null
Class Guid: {00000000-0000-0000-000000000000}
Driver Date:
Driver Version:
Driver Provider:
Driver Section:
Driver Rank: 0x0
Matching Device Id:
Outranked Drivers:
Device Updated: false
Parent Device: USB\ROOT_HUBxx\xxxxxxxx

I have rebootet PC and phone.
Than starting phone in fastboot mode, plugging USB in
Device Manager shows
Android with exclamation mark

I have downloaded the file Qualcomm_USB_Driver_v1.010065.1.zip from qcomdriver.com, extracted it and started Qualcomm USB Driver v1.0.10065.1.exe.
The installation seemed to be successfull.
In the Device Manager is still an exclamation mark, when pluging in the phone while in fastboot-mode.

In Terminal "fastboot devices" brings no results.

When I enter the fastboot mode, for about 0,5s ist written "fastboot mode"
I think, the USB-driver doesn't work.
In the Device Manager:
Other Devices - Android !
An exclamation mark ist shown.

On the webside service.oneplus.com/de/search?key=USB there is not driver for OnePlus Nord N10 5G.

I have tested the driver from developer.android.com/studio/run/win-usb -> usb_driver_r13-windows.zip, but it doesn't work.

The file commandlinetools-win-13114758_latest.zip from the URL "https://developer.android.com/studio?hl=en#download" doesn't work, because it is the wrong file.
It seems, that the right URL is "https://developer.android.com/tools/releases/platform-tools?hl=de" and the file "platform-tools-latest-windows.zip".

When I unpack this file, go to the folder platform-tools, open the terminal and type
adb version
I get the response:
Android Debug Bridge version 1.0.32.

phone: system - developer mode - OEM unlock enabled
Starting the phone in the fastboot (volume up + power) and after that pluging to the PC and write the command
fastboot devices -> no response
fastboot oem unlock -> < waiting for device >

On the linked page "https://community.oneplus.com/thread/64487" is written:

"5. To confirm that it is indeed working, open a command prompt window and enter the following commands:
cd Desktop/android-sdk-windows/platform-toolsadb versionIf it displays "Android Debug Bridge version x.x.xx" it is working. If it is gives an error saying that adb is not a recognized command, it has not been successful. Carefully repeat the steps above if this is the case. Close the command prompt window when you are done."

But the path "platform-toosdb" isn't included in the file commandlinetools-win-13114758_latest.zip.

Extracting the ZIP-file delivers the folder cmdline-tools. I have placed this folder on the Desktop, opened the folder and started the terminal.

PS Directory: C:\Users[username]\Desktop\cmdline-tools> dir
bin
lib
NOTICE.txt
source.properties

PS Directory: C:\Users[username]\Desktop\cmdline-tools> cd platform-toolsadb
cd : The path "C:\Users[username]\Desktop\cmdline-tools\platform-toolsadb" cannot be found

I guess, commandlinetools-win-13114758_latest.zip is the wrong file.

When starting ubports-installer, it is written: "Before installing Ubuntu Touch you must unlock the bootloader of your phone manually. Folllow the steps in the linked page if you haven't already. More..."

On the linked page "https://community.oneplus.com/thread/64487" is written:

1. Download the full Android SDK here (scroll to the bottom of the page>DOWNLOAD FOR OTHER PLATFORMS>SDK Tools Only)
2. Extract the zip and place the android-sdk-windows folder on your desktop. ...

On the linked page "https://developer.android.com/studio?hl=en#download" there is no text "DOWNLOAD FOR OTHER PLATFORMS" and there is no text "SDK Tools Only".
At the bottom of the side are "SDK tools package" for Windows, Max and Linux for download. When I download the file for Windows: commandlinetools-win-13114758_latest.zip and unzip the file, the folder "comdline-tools" appears, which contains no folder "android-sdk-windows". Therefore it is not possible to place the folder "android-sdk-windows" on the desktop, because this folder doesn't exist.

Now I have downloaded Global firmware instead of EU firmware and it was ... sucessful
Downgrade was also successful.

Starting phone
Connecting to the PC via USB
Starting MsmDownloadTool
Windows11 Pro:
cmd [enter]
adb devices [enter]
adb reboot edl [enter]
phone screen is black
MsmDownloadTool: Connected. Clicking Start, then downgrading successful.
Thanks for you support

(I have bought the phone in the EU, but had to use the global firmware)

From URL https://community.oneplus.com/thread/1541327 I downloaded Qualcomm_Drivers_Setup.exe from URL https://drive.google.com/file/d/1zKPFtcc2X_Nf70mcvn9TBu60bHl6Q3cP/view
and installed on Windows 11 Pro.
Options:
o WWAN-DHCP is not used to getIPAddress
o ETHERNET-DHCP is used to getIPAddress (choice)
Phone hold Volume Up and Volume Down, plug in USB-cable, release Volume Up and Volume Down
*** Nothing happens ***

According to https://community.oneplus.com/thread/1541327
Method to get into EDL-mode
(Unlock the developer options by tapping the build number 7 times rapidly in About Phone/About Device.)
(Open the Developer options and enable USB debugging.)
Connect phone to PC and type on Windows 11 Pro:
cmd [Enter]
adb devices [enter]
A pop-up appears up on my phone: USB-Debugging -> "always allow"
adb reboot edl [enter)
screen ist black
Device-Manager: COM & LPT: Qualkomm HS-USB QDLoader 9008 (COM3)
MsmDownloadTool Start was still acitvated and MSMDownloadTool automatically worked for 6 seconds, now showing:
COM: COM3
Status of Connection: N/A
Status of Communication: Multi-immage identify by target sw id is disabled
Progress of Download: (green bar)
Time: 6 s
Status of Last Communication: Device not match image (20886)

phone first start only with Vol.UP+Vol.Down+Start -> choose Start -> Start-Button
*** Still Android Version Oxygen OS 11..4.BEB86AA

Does "Device not match image" mean, that the MsmDownloadTool-Version is not matching to the OnePlus Nord N10 5G?
I had downloaded https://onepluscommunityserver.com/list/Unbrick_Tools/OnePlus_Nord_N100/EU_BE83BA/Q/OnePlus_Nord_N100_EU_OxygenOS_10.5.2.zip from https://devices.ubuntu-touch.io/device/billie2/

Now I tried as follows:

Bios: Secure Boot [Disabled]
PC new start
right mouse click: Start menu - „Terminal (Administrator)“.
bcdedit /set testsigning on
PC new start
OnePlus_setup.exe install
OnePlus_USB_Drivers_Setup.exe install
right mouse click: Start menu - „Terminal (Administrator)“.
bcdedit /set testsigning off
PC new start
Start MsmDownloadTool V4.0 as Administrator - Klick Start - Other - Next - Start
Phone hold Volume Up and Volume Down, plug in USB-cable, release Volume Up and Volume Down
*** Nothing happens ***
Bios: Secure Boot [Enabled]

The files I used I had downloaded from my switched on OnePlus Nord N10 5G phone via USB-cable, becaus I could not find USB-Drivers on the OnePlus homepage.

I use Windows 11 Pro.
In the Device Manager the phone is shown as QUSB_BULK_xxx:xxxx_SN:xxxxxxxx when it is on.

I plugged in the phone to windows 11 pro (phone was on) and Explorer showed the following files

CD-Drive (D:) OnePlus Drivers\OnePlus_USB_Drivers_Setup.exe
CD-Drive (D:) OnePlus Drivers\OnePlus_setup.exe
CD-Drive (D:) OnePlus Drivers\adb_config_Linux_OSX.sh
CD-Drive (D:) OnePlus Drivers\AndroidFileTransfer.dmg
CD-Drive (D:) OnePlus Drivers\autorun.inf

I copied the files to the PC, started Windows 11 Pro in Safe mode and executed booth exe-files.
After that I started Windows again in normal mode.
In the Device Manager the phone is still QUSB_BULK_xxx:xxxx_SN:xxxxxxxx when it is on and plugged in.

Startin in EDL Mode still doesn't work.

Sorry, that it took some days to answer.

In the Device Manager are no COM ports listed.
Only USB:

USB-Controller
-Intel(R) USB 3.10 eXtensible_hostcontroller-1.10 (Microsoft)
-USB-Root-Hub (USB 3.0)
-USB-Verbundgerät
USB-Geräte
-Camera DFU Device

The column under COM is empty. Whether the device is in EDL mode or not, I don't know.

Re: How to Downgrade Nord N10 T-Mobile?

Hello,
I have exactly done, what MrT10001 wrote, to downgrade my OnePlus Nord N10 5g from Oxygen OS 11.0.4 to Oxygen OS 10.5.7, but I guess, the phone is not being found by the MsmDownloadTool:

1. Powering off the phone.
2. Running MSM tool as Administrator (Windows 11).
3. USB cable ist plugged into the PC.
4. Holding Volume UP and Volume Down button together.
5. Plugging in the USB cable into the phone and releasing the two volume buttons.

But now, the phone is not shown on the MSM Download list, nor any COM port is listed.
Therefore klicking start in the MSM Download tool doesn't help.

Is it possible, that the phone has a sim-lock?
Is it possible, that Windows 11 doesn't work?