I got a used LG K4 off eBay and I'm looking to flash a Marshmallow ROM. I tried downloading the SuperSu ZIP file and booting into recovery, but the only option was factory reset.

I rebooted and tried Kingroot, because you don't need to boot into recovery for it to work. It didn't work, it just said 'Root failed'.

I did some research and found out that you need to unlock the bootloader. I didn't know this because on my previous phone the bootloader was already unlocked. I searched on how to unlock it on my device but all the suggestions just told me to boot into recovery.

Is there a good way to manually unlock the bootloader? I have a raspberry pi 3 and my mother has a Windows 10 laptop, so either can work. Thanks!

1 Answer 1


LG has agreed to provide bootloader unlocks for a certain few models. Here is the official LG site for unlocking bootloader.

  • It's best to provide a summary in your answer, so people know what to expect (is the link to instructions, a download, a registration form, or something else).
    – Dan Hulme
    Commented Aug 9, 2017 at 21:42
  • According to the "Supported Devices", No "K" series is supported for unlocking the bootloader.
    – Andrew T.
    Commented Nov 30, 2021 at 12:23

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