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Questions that address Samsung not having fastboot can be found here and here.

My question:

With fastboot you are able to use fastboot boot boot.img to temporarily boot your phone with a custom kernel, and upon reboot use the stock kernel. Is there an alternate to the above command for Samsung phones. Because with Odin, it overwrites the current kernel, so if the custom kernel doesn't work your left with a soft-bricked phone and have to re-flash stock firmware losing all your data.

  • And that's one big reason why you should have a custom recovery! :) You shouldn't even be flashing boot imgs with Odin if you ask me. – Andy Yan Sep 7 '16 at 3:47
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    @AndyYan Pretty sure OP mean fastboot boot bootable.img and it's amazing... It's a way of booting something (a kernel, recovery, etc) one time without modifying anything. Wanna try this kernel without flashing it, no problem... How about fire up TWRP well leaving stock recovery on the device so we can still take an OTA? Sure, you can do that. Wanna see if that new hacked recovery you just compiled works? Oh, it doesn't, just hold power and it's gone. And no, there is no Odin equivalent because Samsung doesn't support fastboot. – acejavelin Sep 7 '16 at 3:58
  • @AndyYan Yea that is what I would be using if possible, their is TWRP for my device which works on Kit Kat, but not Lollipop. This is where I wanted to allow a custom kernel so I can get another attack vector to gain root, and then modify the necessary files. My device is considered a low activity device, therefor its left up to me to craft my own root. Odin/Heimdall is the only other way to flash to the device other then TWRP, which I mentioned doesn't work with the current version of my device – Matt07211 Sep 7 '16 at 4:11
  • @acejavelin Yes you are correct, that is what I want to achieve. And as linked, I have mentioned about odin replacing fastboot – Matt07211 Sep 7 '16 at 4:12
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    @beeshyams The aforementioned links at the top of the post state that samsung switch fastboot for their download mode/Odin, the logical conclusion is becuse it adds extra security. – Matt07211 Sep 7 '16 at 9:22

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