The header_size field contains the size of the boot image header. if the boot image header version is set to 1, the id field contains the sha1 digest for the recovery_dtbo section of the boot image in addition to the kernel, ramdisk. and second sections.. Imgtool. the imgtool utility is another one of the tools i'm including in my book, this time to accompany the chapter about the boot process. i deal a lot with the internal format of images there, and realized i needed a quick extractor. this became more important when i started to deal with the l preview, and google glass system images i used for research.. Opensuse: sudo zypper install android-tools; fetch the boot.img file. extract the boot.img either from rom .zip file or directly from the device: from the stock rom .zip file: some applications like supersu may modify the boot.img directly on the device, replacing it with the stock one would break such applications..
File name: boot.img: alternative file name: boot: file size: 14.63 mb: file type: application/octet-stream: file extension: img: uploaded on: 2015-09-15 14:20:20. You can also check the actual boot.img size of your device by pulling the original boot.img partition using 'dd' command, and if its actually bigger than 5mb, you can increase the value in board_recoveryimage_partition_size.. There is a bug in the semc s1 bootloader... sometimes if the boot.img isnt of a correct size then the device will not boot... the workaround is to add a "filler" file (which is say 512kb file with junk data) to the ramdisk so as to increase the size of the final boot.img file....