Hi @Jam,
as @MrT10001 and @rubencarneiro already informed. Yes Android downgrade to 10.
This website was helpful for me, but you should check the Windows drivers first or simply install them in advance. Windows would then complain if these are already installed.
See therefore first:
My device isn't detected
Go to device manager and make sure your phone shows up as QDLOADER 9008.
If it shows up as QHUSB_BULK, it means Qualcomm driver wasn't installed automatically by Windows Update. Download the latest one from Microsoft website at http://download.windowsupdate.com/c..._fba473728483260906ba044af3c063e309e6259d.cab (source https://www.catalog.update.microsof...updateid=8ee52ba0-bdef-4009-88cf-335a678dd67a ) and install it manually by right clicking on QHUSB_BULK and selecting "Update driver software" and "Browse my computer for driver software" to where you downloaded CAB file.
In the link described above!
Now I wish you good luck and perseverance with the installation.
Greetings Mario