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I have a Samsung Galaxy On7, running stock firmware, Android 6.0.1. I have successfully installed TWRP and also flashed Magisk. In the developer options, I have toggled the "OEM Unlock" option to ON position.

I was reading that in order to flash a custom ROM like Lineage OS, I have to unlock the bootloader. There are a number of methods to check if the bootloader is unlocked, viz. one from fastboot and one by dialling certain commands in the phone dialer. Unfortunately, fastboot cannot recognise my device in Download mode, and the dialler commands are not working too.

I read somewhere that toggling the OEM Unlock option to ON means my bootloader is ulocked. Is that true? Having been able to successfully install TWRP and Magisk, can I conclude that my bootloader is unlocked?

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Install Google's ADB drivers, connect your phone to your PC, open a command prompt and type:

adb reboot bootloader

Then:

fastboot oem device-info

And you will see the bootloader's status, either in the command prompt or on the device's screen.

To unlock a locked bootloader, type:

fastboot oem unlock

Remember that unlocking the bootloader will wipe all of your user data, as a factory reset does. Backup your data first.


Since you have a Samsung phone, remember that Fastboot isn't supported, while Odin is. To unlock the bootloader, simply find the OEM unlock entry in the device's settings and enable it.

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  • In my question, I have stated, "Unfortunately, fastboot cannot recognise my device in Download mode, and the dialler commands are not working too." Commented Aug 12, 2019 at 11:01
  • ah, i forgot. For Samsung phones you dont have to unlock bootloader, it's enought to enable OEM unlock in developer options, and flash new ROM. Because samsung uses Odin instead of bootloader, it much harder to work with bootloader on samsung, and after all there is no need for that, everything will be fine. Just flash that custom ROM you want, from TWRP and you will be fine. Make a backup if anything goes wrong. Commented Aug 12, 2019 at 11:06
  • Please add the comment to your answer so that I may accept it. :-) Commented Aug 12, 2019 at 11:07
  • I edited your answer for clarity, if you don't mind.
    – Grimoire
    Commented Aug 12, 2019 at 13:04

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