ADB detects but, fastboot does not detect device in windows 10

I guess the problem is that you are still using the stock-recovery as it seems.

Apply update from SD card is typically used in stock-recoveries.

TWRP typically looks like this:

^{Thanks to Technobuzz for this picture}

So again you have to follow this procedure for the Galaxy S6 Edge on Android 6.0.1:

1. Download TWRP 3.0.2.0 from their official site and place it on your desktop.


2. Download Odin3 from here and extract it to your desktop. It is a german site - but the download starts after 3 seconds and is clean atleast.


3. Make sure Samsung Kies is not running, then start Odin with administrative privileges.


4. Add the downloaded TWRP file under AP / PDA in Odin.


5. Boot your phone into download mode (volume down + power button), then confirm the dialouge by pressing the volume up button and connect it to your pc via USB.

Your setup should look something like that (don't mind the filename) :

^{Thanks to pocketpc.ch for providing this image}

Then start the flashing process, wait until Odin says PASS! in its message box. Then reboot your phone into the recovery mode and you should be good to go.

If this procedure does not work for you, repeat the process but untick the Auto Rebootcheckbox before flashing. Then manually reboot by holding the power-button for like 5 seconds and try booting into the recovery.

Further Readings:

1. HOW TO: Install TWRP 3.0.0 Recovery on Samsung Galaxy S6 Edge