1. Download and install our update application utility called Line 6 Central. You'll be able to find the download here on our downloads page:
https://line6.com/software/.
2. Once you have that installed, you'll need to boot up the HX One in update mode. Do this by pressing and holding down the LEFT arrow while powering on the HX One. You may not see any screen, only a blank screen when it's in this update mode (The HX One should go into update mode in any case where the update fails on it's own. Holding down the left arrow will just force it to go into this state manually).
3. Connect the HX One to your computer with a USB-C cable. Make sure its connected directly to your computer. No hubs or secondary connections. If you're on a desktop computer, connect it to the back of the machine near the power cable. Be sure to disconnect any MIDI cables during this process (If MIDI clock is sent to the HX One during the update process, the update may not complete. Disconnecting MIDI cables prevents this from happening with third-party devices).
4. Once you launch Line 6 Central, it will ask you if you want to identify the unknown device. Click "Identify", then you should see a list of devices on your screen. Select "HX One". Be sure to login with your Line 6 Username, and then select "Perform Update" for the latest version. This should allow the update to install 100%, and it will display "Update Successful" on the screen.
5. Once the update is installed, you may need to power cycle the HX One, by disconnecting the power cable, and re-connecting. If the update was installed properly, the HX One will boot normally showing the update version on the LCD screen.