> 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/bbo-buffer-installation-manual/advanced_use/bbob_application_upgrade.md).
# Application upgrade
If a new BBOB application will be released the BBO Buffer shall be upgraded.
The BBOB application is delivered in a form of a file named “bbobuffer\_\_ver\_\_mipsel\_24kc.ipk” where *ver* is the application version.
The BBOB application zip can be found in Technical File in [BBO Buffer\Firmware](https://icuscandinavia060.sharepoint.com/:f:/s/Technicalfile/Eh8xzOQEn-NKnTz_hgRBaJEBuvpFfom8X4XA9o1nyiNuZw?e=Qq3rbG).
The upgrade can be done using one of 2 methods
* by copying a new application into the SD card
* remotely by uploading it using the BBOB web interface.
Please note that automatic downgrade is not supported. To install lower version of application uninstall existing version first (command “opkg remove bbobuffer” or using button “Remove” in BBOB web interface: System->Software->Installed).
## Upgrade by copying to SD card
Perform the following steps:
1. Disconnect power from BBOB.
2. Remove the SD card from BBOB.
3. Connect the SD card to a card reader.
4. Select the SD card drive in Windows Explorer.
5. Copy the new version of bbobuffer\_\_ver\_\_mipsel\_24kc.ipk to ‘install’ directory.
6. Remove SD card from the card reader and insert it into BBOB socket.
7. Connect power to BBOB.
8. The new version of the application is installed automatically after BBO Buffer is powered on with the SD card installed.
## Upgrade by upload
Perform the following steps:
1. Open the BBOB WAN URL in a browser.
2. Go to System - Software.
3. Click “Upload Package…”.
4. Browse to select the new version of bbobuffer\_\_ver\_\_mipsel\_24kc.ipk.
5. Click “Upload” and wait until the file is uploaded.
6. The new version of the application is installed automatically.
7. Click “Installed” tab if you want to check the list of installed packages.
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