FASTBOOT commands don't work at all on my Samsung phone

Question

I did every things.
installing all USB driver.
my phone driver.
ADB driver.
enabling USB debugging.
every thing.
but still i have problem with fastboot commands. like if i type : fastboot devices. it tell me waiting for any device . every thing is work perfectly in adb commands like adb devices, but not fastboot. i also installed SDK and google drivers.



I wanna install a custom recovery (twrp) to back up my EFS folder and then root it and then install custom rom :) . but at the first level i got stuck and i cant install the custom recovery. i can do any command like adb reboot download but in downloading mode i cant use fastboot command as fastboot flash recovery. after typing this fastboot command the next line it tells me that "waiting for any device".


— Darth | Sources

Answer

Samsung devices have no fastboot mode. To install a custom recovery, flash a recovery image for your device with Odin/Heimdall.



Do note that although Odin can automatically reboot the phone after flashing, it will not automatically boot it into the recovery you just flashed. To boot into recovery, the moment Odin automatically reboots your phone, immediately hold the key combo to boot the device into recovery. On most Samsung devices it's VOL_UP+HOME+POWER. You should see "recovery booting..." on the top-left of the screen, at which point you can release the keys. You will land in the custom recovery seconds after, from which you could proceed to backup /efs (using nandroid backup) or flash a custom ROM.


— Andy Yan | Sources

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