I want to install a custom ROM on my Galaxy Tab S. Therefore, I need to install TWRP as recovery. For that, I need to unlock my bootloader. I'm following this guide to unlock my bootloader: http://rootmygalaxy.net/unlock-bootloader-android-using-fastboot-commands/
I installed the appropriate drivers and ADB&Fastboot on my computer. Then, I enabled debugging on my Galaxy Tab S. Then, I opened the command console and typed: "adb reboot bootloader". My tablet then restart, but doesn't go into fastboot mode. Instead, it simply reboot normally.
I've tried this on both, Mac OS and Windows. It does the same thing on both systems.
I've tried to boot while manually pressing Home, Power and Volume down buttons. Then, my Tab S into a special mode: Odin mode. I know I've used Odin previously to upgrade my Tab S from Lollipop to Marshmallow. I don't know if the fact that I hve Odin doesn't allow my tablet to boot into fastboot. However, I would need to boot into fastboot to unlock my bootloader and, later on, to install TWRP in order to installer the AOSP 7.0 Nougat custom ROM to my Galaxy Tab S.
How can I do to boot into fastboot mode?
Thank you very much,