Is it possible to check bootloader status using adb of a samsung device back from 2014 or older? (s5 and below) there's no fastboot, and no "OEM Unlock" in developer options and since i need to get the info using pc

Do I need to program an android application to go with my desktop one to detect bootloader status? If so, is it even possible to get bootloader status using an app?

Context: I'm creating a desktop program which needs to determine bootloader status to do certain tasks. I have searched for ways to do it, i found 3 only, none work in my case

Using dialer to find it, I get no output at all..

Using fastboot, There's no fastboot, only download mode

Using an adb command, it helped but it did not output the bootloader status

  • Try this app to see if it reveals bootloader status
    – beeshyams
    Commented Sep 17, 2018 at 14:02
  • @beeshyams thanks, but it does not
    – Galacticai
    Commented Sep 18, 2018 at 5:45

1 Answer 1


On Samsung devices, if there is no OEM unlock in the Developer Settings, then the bootloader is unlocked by default. OEM lock is enabled on carriers models only.

Moreover Samsung devices don't have fastboot, they have a proprietary protocol instead.

  • thanks for the info... that's wierd because my phone is T-Mobile and doesn't have OEM Unlock.... Anyway So I guess i'll have to program my app to either check for the existence of that option in settings, or use fastboot if available
    – Galacticai
    Commented Sep 18, 2018 at 5:47
  • Which variant model is your device? Check in About device options
    – esQmo_
    Commented Sep 18, 2018 at 8:50
  • SM-G900T .. it is T-Mobile (kltetmo) (s5 lte (snapdragon) tmobile)
    – Galacticai
    Commented Sep 19, 2018 at 11:06
  • This variant has a locked bootloader I guess, like most T-MO devices
    – esQmo_
    Commented Sep 19, 2018 at 20:24
  • it is. because it blocked my first ever flashing try and bricked itself ..i don't know how i unlocked it later... and I can't try again because it's unlocked forever
    – Galacticai
    Commented Sep 20, 2018 at 21:48

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