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I have created an image of my Android device (Lenovo A6000) using the command

adb shell -c su 'dd if=/dev/block/mmcblk0p23 > data.img' 

Now I would like to flash this image to the same device, and I am trying to accomplish this using fastboot in the following way

sudo fastboot flash data data.img

I am using the latest version of fastboot shipped with Android's SDK.

Doing the above command I get the error

    target reported max download size of 268435456 bytes
    Invalid sparse file format at header magi
    error: write_sparse_skip_chunk: 
    don't care size 4894735982 is not a multiple of the block size 4096
    fastboot: ../libsparse/sparse.c:143: 
               write_all_blocks: Assertion `pad >= 0' failed.

I suspect it has something to do with the sizes, the image appears to have size ~5GB while the reported max download size appears to be ~2GB.

But I am not sure what the real error is and how to fix it?

Can someone tell me where the mistake is and how to solve it? It seems that if I make a smaller image I can flash it properly.

  • Just asking: Why are you trying the hard way if the device is rooted? Isn't Nandroid backup good for the needs? – Firelord Jul 23 '15 at 16:45
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    Invalid sparse file format -- you didn't create a sparse file. – Matthew Read Jul 23 '15 at 19:49
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    Apart from that: if you created the image with dd, what keeps you from restoring it the same way (from within recovery mode, of course)? – Izzy Jul 27 '15 at 0:37
  • Also you should try the -S option, to split the file while sending. fastboot loads the file over USB into RAM, not directly to the memory (NAND/SD/eMMC) etc... – Kevin Parker Feb 2 '16 at 19:28
  • I have the same exact issue did you find any fix? – user178690 Jul 27 '16 at 9:55
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You can try this command from adb shell:

cat /proc/partitions

But mount lets you see /dev/block/bootdevice/by-name/ (in my case) so if you do:

ls -al /dev/block/bootdevice/by-name/

You have all blocks you want to add. But I'm still searching how to add straight to computer instead to sd card.. if somebody knows how. thanks

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