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Download the latest Plethora firmware .bin file from here

Unzip the PlethoraX5_X_X_XX.bin firmware file and save it on your computer.

Connect your Plethora X5 to your computer via the included USB cable. The Plethora will show up on your computer as a device.

Now drag and drop the PlethoraX5_X_X_XX.bin firmware file into the Plethora device folder on your computer.

Once the file is copied to the device folder, disconnect the USB cable.

Power cycle your Plethora and wait for the firmware upgrade to finish.

All done – your Plethora X5 is now updated to the latest firmware.

You can check the firmware version installed in your Plethora’s by accessing the SETTINGS / GLOBAL / ABOUT menu.