# Wrong image flashing command on macOS in reference flashing guide

**URL:** <https://forum.webosose.org/t/wrong-image-flashing-command-on-macos-in-reference-flashing-guide/522>\
**Category:** Uncategorized\
**Created:** [August 27, 2018, 12:54am UTC](https://forum.webosose.org/t/wrong-image-flashing-command-on-macos-in-reference-flashing-guide/522 "2018-08-27T00:54:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![flowergom](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.webosose.org/flowergom/32/160_2.png) [@flowergom](https://forum.webosose.org/u/flowergom)\
**Post date:** [August 27, 2018, 12:54am UTC](https://forum.webosose.org/t/wrong-image-flashing-command-on-macos-in-reference-flashing-guide/522/1 "2018-08-27T00:54:29Z")

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When I flashed OSE image with reference flashing guide ([Flashing webOS OSE | webOS Open Source Edition](http://webosose.org/discover/setting/flashing-webos-ose/)) on macOS, I got following error message.

> sudo dd bs=4M if=./webos-image-raspberrypi3-master-20180822064009.rpi-sdimg of=/dev/rdisk4  
> dd: bs: illegal numeric value

This option of bb command is wrong, it should be fixed such as below.

> 4M -\> 4m  
> $ sudo dd bs=4m if=./\*\*.rpi-sdimg of=/dev/rdisk _n_

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**Author:** ![felipe](https://avatars.discourse-cdn.com/v4/letter/f/90db22/32.png) [@felipe](https://forum.webosose.org/u/felipe)\
**Post date:** [August 27, 2018, 2:27pm UTC](https://forum.webosose.org/t/wrong-image-flashing-command-on-macos-in-reference-flashing-guide/522/2 "2018-08-27T14:27:46Z")

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Thank you for reporting this. We've fixed the command and added a note on it.