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!


LG has agreed to provide bootloader unlocks for a certain few models. Google bootloader unlock. Is an officia LG site. Good luck!

  • "Google bootloader unlock" isn't even a site. It'll give different results for different people. If you want to recommend a site, you need to actually link it. It's best to provide a summary in your answer too, so people know what to expect (is the link to instructions, a download, a registration form, or something else).
    – Dan Hulme
    Aug 9 '17 at 21:42

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