Open the extracted folder, you will find boot.img.lz4 inside. Now extract the boot.img.lz4 with the 7-Zip ZS tool to get the boot.img file. To extract boot.img.lz4 file, just right-click the file and choose extract with 7-Zip ZS. Although you can grab the boot.img with above steps but this file maybe of no use. Flash boot.img without PC for those on 2.20! Switch ROMs & restore backups on the go. I am one of those people that constantly likes to change ROMs. I like AOKP/CM, but sometimes I need to use the better camera on Sense based ROMs. I loved Download and install the latest Magisk Manager app. Then, connect your device to the PC via the USB cable. Copy only the boot.img file from the extracted folder to your device storage. Next, open the Magisk Manager app and select INSTALL and choose to install again. Tap on “Patch Boot Image File”. Tap "Install" again on the popup, then choose "Patch Boot Image File." Next, the built-in file browser will appear. Open the side navigation menu (hamburger icon), then choose "Downloads." From here, select the "boot.img" file, then wait roughly one minute while Magisk patches the file. Tap "Close" when it's done. Without root or TWRP, they don't/can't do anything that requires accessing/modifying anything other than user data. Extracting the "ROM" requires root or TWRP because it resides in the system partition which can't be accessed by the user without root or TWRP. No, it isn't a "catch 22", it is the way android is designed h5Mvd.

backup boot img without root