Hi,
I am trying to flash Sailfish to Xperia 10 on Windows 10, bit I am not able to properly install fastboot drivers. I am using Xperia X driver as described in official manual. I even tried Xperia 10 II driver, bur without luck. I am on Windows 10 2004, as I have found it may be caused by this. Do you know how ro resolve it. Before I flashed in on Linux and it worked flawlessly. Thank you.
try installing generic adb/fastboot android drivers from xda
I found this post about this problem, but I am still stuck with Android 
https://together.jolla.com/question/227831/unable-to-install-fastboot-driver-in-windows-10-v2004/
Update your Windows computer to version 20H2 followed by the cumulative update from Dec 2020.
This makes it possible to install the fastboot driver successfully, again.
Thank you. I have it already installed. With latest Windows upgrade it is possible to flash Sailfish!
I’m confused. Can you provide me with the details for what version of Windows you are running?
I have Windows 10 Pro v. 2004 and even after following the guide provided by Jolla/SailfishOS, I cannot get my PC to see my Xperia XA2 Ultra device when putting it in Fastboot mode. The guide mentions a problem with my version of Windows but if you got it working somehow using Xperia X drivers for your device, I should theoretically also be able to get my drivers installed.
My device manager:
Windows details:
I don’t have my computer with me so I don’t know exact OS build number, but with latest windows update I was able to install fastboot driver for Xperia X, which works fine for my Xperia 10. With previous version it simply did not work. I can check exact build number later, when I get to my laptop.
Latest build number:
I also have a problem with the fastboot driver installation. My Windows 10 is even newer than 20H2, 21H2, so that should not be the issue? I tried all options of other drivers mentioned in this thread and the old one quoted by susenerajce. Every time I just get “windows could not find the driver for this device” when I choose any of the folders with the driver files in them (in Device Manager). I also tried this on another Windows 10 laptop with the same result. Would anyone have any more suggestions what to try? I can’t get the terminal to do anything at the point 7.12 of the Sony Xperia 10 II installation instructions, probably because of the fastboot driver problem.
And you are sure you actually got the phone into fastboot mode (blue LED)?
Other modes need other drivers, but those are irrelevant here.
Yes, I did. think I finally got to choose the right file (instead of folder) when I tried another way and it might be working now. Thanks anyway for the reply!
If flashing under Linux works just fine then why not boot a Linux Live CD/DVD/ISO environment from an USB Stick ?!
For Windows you can try this : https://github.com/fawazahmed0/Latest-adb-fastboot-installer-for-windows 
Hi pyrkimys. Care to share your soloution? 
For the record, the key for me was to follow the instructions precisely. So don’t try to let Windows find drivers, you must explicitly choose the .inf file. And use the Xperia X driver.
