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DIY: Harman Kardon Software Upgrade for AVR 2600 & AVR 3600 Home | A step-by-step guide to help you upgrade the software on your Harman Kardon AVR 2600 or AVR 3600 receiver.
Harman Kardon brings its AV receivers into this century with networking, streaming and green tech | Digital Trends
User manual Harman Kardon AVR 161 (English - 52 pages)
HOW TO RESET HARMAN KARDON AVR 151,161,171 - YouTube
Harman Kardon - state unknown - Configuration - Home Assistant Community