> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/ceruleantracker/installing-firmware/putting-dvl-devices-into-hardware-bootloader-mode.md).

# Putting DVL Devices into Hardware Bootloader Mode

* Disassemble the device, and locate the BOOT button (see the figured below). 
* Hold the BOOT button down while applying power.

<figure><img src="https://2098770382-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJmHibmWKSWDSTSNZwtIB%2Fuploads%2FBQWPad59BkxLzuwMsnF0%2Fimage.png?alt=media&amp;token=28b0fd48-d9f8-44f6-a774-c83cc09a9569" alt=""><figcaption><p>DVL Boot button location</p></figcaption></figure>