> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/s2gw-installation-manual/advanced_use/s2gw_application_upgrade/write-app-to-sd-card.md).

# Write app to SD card

To do this perform the following steps:

1. Disconnect power from S2GW.
2. Remove the SD card from S2GW.
3. Connect the SD card to a card reader.
4. There are 2 partitions on the SD card and only one of them is readable by Windows. Windows will propose to format the other one, do not do it and click “Cancel”.

![](https://623241058-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3O2JmRv8Cq2LTrIfpgxe%2Fuploads%2Fgit-blob-d6c427fac0a74ea23834e9d88445597084b716d0%2Fimage7.png?alt=media)

5. Look for “boot” partition (drive K: in example). Please note that the drive letter may be different in your case.

![](https://623241058-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3O2JmRv8Cq2LTrIfpgxe%2Fuploads%2Fgit-blob-268b60b2157dbd9b166a8c4c75bf065398f2cd57%2Fimage8.png?alt=media)

6. Open boot:\ICU folder in Explorer. There shall be only nodeservers.xml file there.

![](https://623241058-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3O2JmRv8Cq2LTrIfpgxe%2Fuploads%2Fgit-blob-c570adbfaa5e2a1600549f1bcf449ba846a86a78%2Fimage9.png?alt=media)

7. Put the new software version files in this directory.

<figure><img src="https://623241058-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3O2JmRv8Cq2LTrIfpgxe%2Fuploads%2FjnxO54Gr2pJW0Fi5OHvU%2Fimage.png?alt=media&amp;token=d01b2011-b009-4de8-ac82-2744c2d01c1c" alt=""><figcaption></figcaption></figure>

7. Remove SD card from the card reader and insert it into S2GW socket.
8. Connect power to S2GW.
9. S2GW shall start automatically.
10. The files, placed in boot:\ICU folder, are moved to their proper locations after S2GW start so if you will check the directory again there will be only nodeservers.xml file.


---

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