• We recommend that you use our free Spectre-Application (available for Mac and PC). You can download it here: http://www.waldorfmusic.de/en/downloads/536-spectre.html 
• First, switch off your Blofeld with the mains switch. 
• Connect the Blofeld directly to a free USB port on your computer with an appropriate cable. Do not use a USB-Hub! 
• Switch on your Blofeld and wait until your operating system (Windows XP/VISTA/Windows 7 or Mac OS X 10.4 or later) automatically recognizes the Synthesizer as an „Audiodevice“. 
• Start the Spectre-Application. With it you can check if your operating system has recognized the Blofeld correctly. Klick on the Audio/MIDI-button. Under the MIDI outputs the Blofeld should be listed as an available output. If that is not the case please check the previous steps again. 
• In Spectre, click on the upgrade button and find the Blofelds Firmware-MIDI-File. Confirm with OK to start the download. 
• You can download the latest Firmware version for free here: http://www.waldorfmusic.de/en/downloads-blofeld/537-system.html 
• The Blofeld shows a graphic that indicates that a firmware is being loaded. Additionally the MIDI input LED is illuminated. Under no circumstances turn off or disconnect the Blofeld during this operation. 
• After approximately 2 minutes the firmware has downloaded. 
• Now press the Blofelds PLAY button to finish the operation. 
• Now you can use the new firmware. 
• At the next reboot you can see the version of the currently installed firmware at the bottom of the screen. Then the serial number and the OS-version number are displayed. It should look something like: V1.15-1

Note: If you use a media player like the Windows Media Player make sure that the “loop”-feature or the automatic repeat feature are turned off during the update.