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Image: 5 Name: recoveryĝimensions: 216x1080 Unknowns: 0 100 Offset: 1b800 Size: af28 Image: 4 Name: bootloaderĝimensions: 216x1080 Unknowns: 0 100 Offset: e800 Size: ce50 Image: 2 Name: unlockedĝimensions: 95x71 Unknowns: 504 1750 Offset: 7000 Size: 7ac Lastly, you can use it for imgdata extraction as well (as the file format there is derived from that of the boot (~) % imjtool Devices/Nexus5/Partitions/imgdata You can also use it to extract the filesystem image (basically, do what simg2img (~) % /imjtool Images/Glass/system.img extractĢ62144 blocks of 4096 bytes compressed into 1304 chunks (39% compressed)Įxtracted image is in (~) % file extracted/image.imgĮxtracted/image.img: Linux rev 1.0 ext4 filesystem data (extents) (large files) # And the bootloader components are ready in extracted/ If you're using the Google images, it's (~) % imjtool Images/hammerhead-lpv81c/bootloader-hammerhead-hhz11k.img extractĦ images detected, starting at offset 0x200. rw-rw-rw- 1 morpheus staff 834688 Oct 1 19:28 (~/Documents/Android/Book/src/ImgTool) % file extracted/*Įxtracted/ramdisk: gzip compressed data, from UnixĮxtracted/kernel: Linux kernel ARM boot executable zImage (little-endian)Įxtracted/kernelimage: data # unrecognized by file(1), but still uncompressed rw- 1 morpheus staff 16809984 Oct 1 19:28 kernelimage Gzip: extracted/kernelimage.gz: decompression OK, trailing garbage (~/Documents/Android/Book/src/ImgTool) % ls -l extracted # Locating the ANDROID! (~/Documents/Android/Book/src/ImgTool) % od -A d -t c boot.img | grep "A N D"Ġ000256 A N D R O I D ! Х ** ` \0 \0 200 \0 (~/Documents/Android/Book/src/ImgTool) % dd if=boot.img of=boot bs=256 skip=1ġ6776960 bytes transferred in 0.153107 secs (109576753 (~/Documents/Android/Book/src/ImgTool) % imjtool boot extractĬmdLine: console=ttyHSL0,115200,n8 androidboot.hardware=qcom user_debug=31 ehci-hcd.park=3Įxtracting contents to directory: extracted # Back on (~/Documents/Android/Book/src/ImgTool) % adb pull /data/local/tmp/boot.img the HTC One M8) may need a bit of processing, in this case stripping the 256 header HBoot (~/Documents/Android/Book/src/ImgTool) % adb $ # ls -l /dev/block/platform/msm_sdcc.1/by-name/boot Google's update, Amazon's update.bin, etc), or by dd'ing for a device, then copying it over.
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To obtain an Android system image, you can either get it from a zip (e.g. is an optional parameter to extract the image components Where: _img_name_ is the name of an Android boot or bootloader image (or boot partition)
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If I know about them (preferably through a download link to the image) I can easily fix it. There are myriad image formats and corner cases which I don't normally run into, but you likely will. What if it doesn't work on _ (some image or file)? LET ME KNOW. So it was trivial to run this tool to extract it - specifically, get to the ramdisk, then cpio -ivd and make sure I can have a peek at it before installing. I just downloaded An NVIDIA Shield root image, for example - which is really nothing more than a bootimg. Another bonus feature it provides is unpacking the Linux bzimage kernels.Īnother reason - If you're downloading a rooting tool - and you want to avoid getting malware. Think of it as the inverse of mkbootimg (from the AOSP), coupled with simg2img (the sparse image extractor). But if you need a quick tool to unpack Android images, this is useful. As usual, you might want to check out the RSS feed, or follow my company's Twitter for more updates. There are macOS (Intel), Linux x86_64 and Android ARM64 images (remember they might need chmod +x to run, and prefix with. I've also had to change the name (from imgtool to imjtool, as of March 2020) since it turns out the former it taken up by MAME.īy any name, you can get the tool ? right here ? Over time, as I've encountered more and more proprietary image formats, I've had to extend the tool to support them all. This became more important when I started to deal with the L preview, and Google Glass system images I used for research. I deal a lot with the internal format of images there, and realized I needed a quick extractor. The imjtool utility is another one of the tools I'm including in my book, this time to accompany the chapter about the Boot process. Imjtool - A tool for unpacking Android boot and system images imjtool (formerly known as imgtool)