How to unlock bootloader

[frifo]

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.

[MrT10001]

@frifo So that essentially rules out the driver. Unplug the device from the PC and reboot the device and your PC.

[frifo]

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

[MrT10001]

@frifo Right click and choose properties, what does it say?

[frifo]

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

[MrT10001]

@frifo Windows 11? Check optional updates in Windows updates.

[frifo]

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

[MrT10001]

@frifo said in How to unlock bootloader:

Device Manager shows Android with exclamation mark

That means there is an issue with your drivers.

[frifo]

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?

[frifo]

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!