Here's the latest update file for Fire TV Stick 4K. You need to be unlocked and have TWRP recovery successfully installed. I will be uploading the latest non rooted stock images for now on for the Fire TV Stick 4K only because this is my primary device I use daily, and I'm testing out new things for my device to see whether it works or not when I attempt to disable, debloat, remove, to know exactly what is what, which is which, to basically get a concept for major performance improvements and more functionality. Remember this stock rom comes unrooted. If you want to be rooted, download and flash the latest Magisk version.
Also I've witnessed and experienced problems myself deleting apps in the /system folder. I'm finding several ways to bypass that. Root still works after its flashed.
Original official stock rom for the Fire TV Stick 4K (22.214.171.124, 3590962564) (no need to change .bin to .zip): https://drive.google.com/open?id=1Ll...9QCMmql2Zyu8W8