C'est bien la procédure ou il faut déposer les 2 fichiers dans le dossier sur l'ordinateur et débrancher le cable usb qui fonctionne.
http://www.roland.com/support/(...)80713
Adjust the OUTPUT LEVEL knob to minimum.
* Do not connect the GT-100 and the computer yet.
Hold down [ SYSTEM ] button and press and hold [ POWER ] switch.
The message "GT-100 Updater" will appear on the display.
Connect the computer to the GT-100's USB port by a USB cable.
The message "USB Connected." will appear on the display.
Open the BOSS_GT-100 icon.
"Removable Disk (*)" may appear instead of the BOSS_GT-100 icon.
Copy (drag and drop) all the files included in the "gt100_sys_v202" folder into the "BOSS_GT-100" icon.
* Do not copy the "gt100_sys_v202" folder.
Disconnect the BOSS_GT-100 from the computer.
With Windows 8 / Windows 7 / Vista / XP
Right-click on the "BOSS_GT-100" icon in My Computer (or the "Removable Disk (*
" icon) and execute "Eject."
With Mac OS
Drag the "BOSS_GT-100" icon to the Trush icon in the Dock.
Disconnect the USB cable.
The message "Push [WRITE] to start" will appear on the display.
Press [ WRITE ] button to start the update process.
The message "Completed." will appear on the display when the update process completes.
Turn the GT-100 power off.
Please verify the version number "2.02" with the procedure described in "How to tell the version" part of this document