First, you cannot do a backup using fastboot. Fastboot is like a one-way road: you can only use it to write partitions (either by flashing a corresponding image, or by wiping it) – but you cannot "pull" a partition. Which leaves ADB. Yes, it's possible via ADB – but it will require root.
First, 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. Then tap on “Patch Boot Image File”.
2. Insert a spare micro SD card into your computer. Note that this card will be erased. 3. Launch Raspberry Pi Imager and under Operating System scroll down to Misc Utility Images and left click
A: boot.img and init_boot.img are terms associated with Android operating systems and their file structures. Here boot.img file contains a generic structure with kernel and ramdisk details while init_boot.img file contains the generic boot structure with initialization bootloader.
I have SmartLike Lyf Water 8 LS-5015 with Android 6.1 Marshmallow vendor updated. I want to take NAND backup before rooting through loading TWRP recovery in fastboot mode (fastboot recovery twrp.img). I tried with 3 TWRP recovery images listed below: one is TWRP 2.8.4 recovery image from the official TWRP website and the other two are from XDA.
If you modify your device, bottom line, you should leave it unlocked so you can fix things or go back to stock if needed, otherwise you could turn it into a paper weight. Even if root is done without modifying the boot.img, I would still keep it unlocked as there are usually still system changes.
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backup boot img without root
