Go to www.telesystem-world.com and enter the download/updates section to download the .zip file (or .rar) and follow the instructions in the .pdf file it contains.
The updates on the homepage are for the following products: TS1.0GX (cod. 28020005), Music Box TS1-E AV (28030002) and TS2-EAV (28030003).
N.B.: The TS1.0GX update solves the problem of turning the appliance back on (with a few products the batteries had to be removed and replaced for it to be turn on again).