There are a log of Fastboot blogs out there but what they don't always mention is, Samsung devices have no fastboot mode. So if yours is a Samsung device, don't waste time on any of the drivers and settings, because it will not work on Samsung. You can use adb but not fastboot.
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HMD Global is making Nokia branded phones for a few years now. However, there is still no official webpage at Nokia.com from where you can download device drivers. On most Nokia phones, the Nokia USB drivers come bundled. A CD ROM will show on the computer when you connect the phone. The Nokia Phone USB Driver installer rests in that read-only disk. However, there are situations when the phone is not working properly (for example: Stuck on Download Mode) and you need the drivers to connect the phone to a PC and try to fix it.
Problem solved. At the end I saw that drivers for android were not installed. I installed drivers from this site -developers.com/showthread.php?t=2126036 and device is visible by fastboot. One thing I don't understand is why adb saw device and fastboot not.
I didn't realize it right away, but there are different ADB drivers and Fastboot drivers. I had installed the google usb drivers with the SDK extras and ADB worked great but I got the "waiting for device" trying to flash in fastboot mode.
I went to device manager from the control panel and saw the "Android 1.0" device with the yellow icon showing it wasn't working right. I had to update the driver and pick from the list of existing drivers which had a fastboot entry.
I had the same problem described by 'pepuch' on my HTC Desire S. I tried different drivers on relatively new computers running Windows 8 and Windows 10. In the end I found a link suggesting that I should try the (same) procedure on an older (desktop) computer which I did and the computer managed to detect my Desire S in fastboot USB mode and I managed to read the ID token. The link which steered me to the solution follows: -one-rooting-roms-hacks/345350-htc-one-pc-doesn-t-recognize-bootloader.html
If no drivers work on Windows 10 or 8.1/8 and your goal is to just use fastboot to flash boot.img (Probably because you have S-ON), there's the way of the Linux:Get a USB stick ready and use Live Linux Creator and install a Live Linux like Ubuntu or Lubuntu onto the stick. Boot to the Live version (maybe you can use VirtualBox VM on Windows, not sure). Open Terminal with Ctrl+Alt+T.Type (without comments with // ofc):
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