: Visit the official Harman Kardon Support Page
supports both USB and wireless updates, for stability. Method 1: USB Update (Recommended) harman kardon bds 570 firmware update
: You will need a USB flash drive (FAT32 formatted) and a stable power connection. Never turn off the unit during the update process , as this can permanently damage the receiver. Step-by-Step Update Guide : Visit the official Harman Kardon Support Page