Hardware Limitations: Note that no software update can upgrade the HDMI ports from HDCP 1.4 to 2.2, as this requires a physical hardware change for 4K content. How to Perform the Software Update The most common method for the is a manual update using a USB flash drive. Software Downloads - Harman Kardon harman kardon avr 151 software update

Part 4: How to Perform the Harman Kardon AVR 151 Software Update – The Procedure

Power on the AVR 151 and follow these steps precisely. Do not press extra buttons. Software updates for the Harman Kardon AVR 151

Option A: The Wayback Machine (Internet Archive)

• Go to web.archive.org.
• Search for the original URL: https://www.harmankardon.com/software-updates/avr151.html
• Look for a snapshot from 2014–2017. You may find a downloadable .zip file named AVR151_FW_v210.zip.

Are you trying to fix a specific bug (like HDMI handshake or sound dropping)? Go to web

• HDMI handshake failures: Try a powered HDMI switch between your source and the AVR. This regenerates the signal.
• No audio from streaming apps: Change the streaming device’s audio output from “Auto” to “Dolby Digital 5.1” or “Bitstream.” Disable “Dolby Digital Plus” (AVR 151 does not support DD+).
• Bluetooth pairing issues: The AVR 151 uses an external Bluetooth dongle (sold separately). Only specific dongles (Harman Kardon BT-1) work. No firmware update will fix generic dongles.
• Protection mode (blinking red light): This is hardware-related – overheated transistors or shorted speaker wires. Firmware cannot fix it.

Harman Kardon AVR 151 Software Update Guide

Before You Start: Important Notes

The Harman Kardon AVR 151 (entry-level 5.1 receiver, circa 2012–2014) does not have:

Once the process is finished, the receiver will typically restart or prompt you to power-cycle it. ⚠️ Important Safety Tips Never Turn Off the Power: