ADB detects but, fastboot does not detect device in windows 10 I am trying to root my phone. I have flashed TWRP recovery from here using Odin. I have installed Android Studio for Android SDK. The command adb devices shows the device connected but fastboot devices just gives me a blank. I have searched for solutions but most of them suggested to install drivers. I have installed the drivers suggested whenever applicable but, the result did not change. I have this issue too, when I select Apply update from SD card in custom recovery I get the following error


  E:failed to mount /sdcard (No such file or directory)


The solution suggested in many sites to side step the above error was to use adb and fastboot. Please help me solve this issue.

My Phone Info:  


Samsung Galaxy S6 Edge
Android 6.0.1
SM-925T
G925TUVU4EPF1
For most Android devices, there is a fastboot menu with and image of an open Android and some options. Accessing it usually involves turning on the phone while pressing one or both of the volume buttons. However, Samsung devices have it differently.

Instead of using fastboot, you use Odin. (These instructions are for a galaxy tab 3, might vary by device.) If you turn on the phone while pressing home and vol down, you enter download, or if you used Odin before, Odin mode. This is used instead of fastboot to flash Roms.

There are many videos on how to use Odin to flash Roms like CWM and TWRP, so search for one of those.