You can update the firmware on Blockstream Jade via your Blockstream Green application.
Open Blockstream Green on your phone.
Connect Blockstream Jade to your phone using the cable provided by Blockstream, or another cable that is compatible with your phone.
If a firmware update is available, Blockstream Green will display the update details in your mobile app. Tap Continue.
Blockstream Jade will now display its current firmware as well as the available firmware update. Use the small wheel on your device to navigate to the check mark at the bottom right, then press the button next to the screen to continue with the update.
The update may take a few minutes. You will be able to follow the process via a progress bar on Blockstream Jade. When Blockstream Jade displays an "Upgrade successful!" note, the update is complete.