# Delta apply fail with "xdelta3: target window checksum mismatch: XD3\_INVALID\_INPUT"

**URL:** https://hub.mender.io/t/delta-apply-fail-with-xdelta3-target-window-checksum-mismatch-xd3-invalid-input/1805
**Category:** General Discussions
**Created:** [April 20, 2020, 7:42pm UTC](https://hub.mender.io/t/delta-apply-fail-with-xdelta3-target-window-checksum-mismatch-xd3-invalid-input/1805 "2020-04-20T19:42:32Z")
**Posts on this page:** 1
**Showing post:** 14

<div class="post-metadata">

### Author: ![malveo](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/malveo/32/704_2.png) [@malveo](https://hub.mender.io/u/malveo)
#### Post date: [April 24, 2020, 2:55pm UTC](https://hub.mender.io/t/delta-apply-fail-with-xdelta3-target-window-checksum-mismatch-xd3-invalid-input/1805/14 "2020-04-24T14:55:20Z")

</div>

Hi Mirzak,

I confirm that by adding

```auto
EXTRA_IMAGECMD_ext4 = "-i 4096 -O ^64bit"

```

the /dev/hda2 and /dev/hda3 are equal.

```auto
root@qemux86-64:~# cmp /dev/hda2 /dev/hda3

```

and the fix works as expected.

Thanks,  
Mauro

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