Now, install the QPST software if it is not already installed, and then run it.Now you should have driver installed to both interfaces.
You may get warning because hardware id doesn’t match.
Then find Qualcomm " HS-USB MDM Diagnostics 90B6" and click Next to install it. Browse drivers in "Xperia 1 Qualcomm Drivers" and find "qcuser.inf". Select "Let me pick from a list of available drivers on my computer". Select "Browse my computer for drivers". (You have to install the same driver to both of the devices, that's very important) 
Right click the device and select Update driver with the driver I put in this post. Check in Device Manager after enabled Engineer Toggle and connected the USB cable to your computer you see two Unknown device labeled your phone model number. You have to install diag-driver manually if you have Android 11 installed. If the installation does not work and blocks at the end, close the window, for me it worked anyway. First of all, you need to install the OnePlus driver that I put in the archive. Once done go to the dialer, and type #*801#, then select the "Engineer Mode Toggle" button. apk file to the root of your phone via your pc, then find this file, and execute it to launch the installation of the app on your phone. Connect your phone to your computer via USB. On phone you have to dial to *#8011# to enable USB-diag.To disable it, go to Settings -> Developers Menu and disable/enable USB-Debugging to disable USB-diag. Be careful because this can make your device unusable. Before continuing, I remind you these changes could end your device warranty. Example OnePlus 8 (China) 5G doesn’t work in USA even it support n41 (T-Mobile/Sprint) band because it doesn’t support 4G anchor band used in USA. If hardware doesn’t support, you can’t enable/disable band. This instruction only allow enable/disable 4G Carrier Aggregation & 5G EN_DC combinations and band support if hardware support it. List of networks where 5G is enabled by default on OnePlus 9 and 9 Pro List of networks where 5G is enabled by default on OnePlus 8 and 8 Pro OnePlus 7 Pro 5G have only 5G enabled in EE UK and Elisa FI networks. List of supported devices I just found on the Internet : I'm going to put you right here a personal download link of all the files and software I used to make it work. Simply after months of encountering the same problem, namely that my phone was not found in the list of phones in QPST, I finally managed to work out a solution, which FOR THE MOMENT works correctly, and does not seem to be too shaky, between hours and hours of reading tutorials. Hi everyone, after struggling to find a solution to the QPST lockup due to the new version of Oxygen OS 11 at the end of 2020, I finally managed to figure out how to do it and be able to activate 5G in all continents ! EN : (FR en dessous) (Sources at the end)
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