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