Exploit Discovery

Unlocking the 4K Bootloader – Exploit Discovery

It is now possible to unlock the bootloader (and install TWRP) on the Firestick 4K.
This opens up endless possibilities (root, blocking OTA updates, alternative firmwares/roms, etc).
This is possible thanks to an exploit discovered by a talented coder (with the username: xyz) at the XDA Developers site.
Together with another coder there, k4y0z, they have put together a package for running the exploit. They call it: kamakiri
The forum thread where they discuss this is located here:

[UNLOCK][ROOT][TWRP][UNBRICK] Fire TV Stick 4K (mantis)

Be sure to visit the page there and offer them your thanks (use the Thanks button).
Now I found the instructions there a little confusing, being a Linux newbie, so I have written my own instructions below.
The instructions assume you have a Windows PC/Laptop.
By all means use the guide/s on xda if you wish, or use mine. Whichever you are most comfortable with.

My guide goes a little further than theirs.
While theirs only discusses unlocking the bootloader, I detail how to root the 4K, how to stop Amazon OTA updates and how to completely remove the Amazon Launcher and install an alternative launcher.
I also provide details on installing an alternative onscreen keyboard for the 4K and a file explorer.

I have made a 3-part video guide on the whole process

4 thoughts on “Exploit Discovery”

  1. I’ve followed your instructions to set up the modded Fire OS on a VirtualBox and followed your instructions in Part 1 and Part 2 but I’m receiving an error ‘device reports readiness to read but returned no data (device disconnected or multiple access on port?)’ Have you seen this before ?
    I have used the exploit using your instructions before so I think my setup is correct. I didn’t howere stop the OTA which put me on the latest version so I don’t know if that is causing this problem.

  2. Hi Flakie, I got to part 2 on youtube I was doing really well then did the reboot -p now the device is not listed when typing adb devices I have tried everything from cable changes usb port change restart computer, even when to part 3 and saw the connect via adb connect (ip) and that doesnt work.
    any ideas also starting again from the start with the foil again doesnt work. I do see that the device dows connect and I see that its as a mtp and can access the directory which is empty

    1. Sorry to hear there is a problem. I believe the reboot -p you mention is just after installing Magisk? I have never seen this fail. If you cannot get ADB working then an option is to run the exploit again. If you do this you should be able to get back to TWRP, at the final stage of the exploit process. If you are unable to do this then another option is to buy an OTG cable and connect a mouse to this, or better still a keyboard/mousepad combo device (such as the Logitech K400 Plus, which I use myself). This will allow you to boot into TWRP (with an OTG cable an option is available to cancel the boot and go into TWRP when powering up the 4K). From TWRP you can try installing Magisk again to see if that helps. If not you will be able to install a new image of FireOS. Either of these I can help you with.

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