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Pretty often I stumble upon guys having issues to flash boot.img via fastboot, especially for noobs on the block. Also when flashing new Kernels it`s handy, if you always have your current boot.img as flashable on your device in case something is going wrong or you simply don`t like the new Kernel.
So here is the very short how-to:
1. Download the BootUpdate_by_hestheone64.zip
2. Open the zip with winrar or 7zip and drag the boot.img in the zip (just below Meta-Inf)
3. Copy the zip to your SD and flash convenient in Recovery
Download Boot Recovery flasher: