You would first need to download the latest firmware from the product page of the specific amplifier. Scroll down to the bottom of the page until you get to the “downloads” section.

M4800           M4840          M6400          M6800

Once you have the latest firmware saved to you computer, log in to the web interface of the M series amplifier and navigate to the Device Configuration tab. In the bottom left corner of the page, you will find the firmware update button.

The amplifier will then begin updating the firmware. There will be a percentage ticker showing progress of the update.

Once it reaches 100%, the amplifier will reboot, it will take about a minute. At this time the web interface will be unresponsive. After a minute or so, either refresh the web page, or click on a different tab within the web interface and it will re-load the page.

You will be able to confirm the update by checking the revision # in the top right section of the configuration tab.

Firmware update instructions: Concert XR 4/6/8 receivers and Maestro X7/X9 processors 

IMPORTANT NOTES: 

Dirac files:

Firmware updates clear any Dirac calibration settings that are currently uploaded to the XR receivers / X processors. Make sure you have access to the saved Dirac calibration file on your computer so you can upload back to the receiver/processor once the firmware update has completed.

Store a secure backup of the receiver or processors settings:

Front Panel: Press and hold the MENU button on the front panel for about 4 seconds, the Engineering menu will be displayed. Scroll down to and select Store Secure Backup > select Enter Pin, the default pin is 0000, press Select. 

To check the current firmware version of your receiver or processor:

Press and hold the front panel INFO and DIRECT buttons together for 4 seconds. The firmware version will be displayed as a HOST/IAP number, for example, 1.07/09. The first number is your firmware version.  

USB DRIVE FORMAT: the USB drive should be formatted for Windows FAT or FAT32. To speed up the update process you may want to use two properly formatted and empty USB drives since the USB update process requires that you load the Host and Network update files separately, you can put one file on each of the two drives [Refer to step 7 below].