ONKYO tx-nr646 User Manual

Firmware Update

There are two methods for updating the firmware; via 

network and via USB.

Use the one that best suits your environment.

● For the latest information on updates, visit the Onkyo 

website.

● Before updating, make sure that the speaker setup 

microphone is not connected.

● During an update, do not

–  Disconnect and reconnect any cable, USB storage 

device, speaker setup microphone or headphones, 

or perform any operation on the component such as 

turn off its power

–  Access to this unit from a PC or smartphone using 

Android application

● The update may take about 30 minutes to complete for 

either method: via network or via USB.

Furthermore, existing settings are guaranteed 

regardless of the method used for update.

Disclaimer: The program and accompanying online 

documentation are furnished to you for use at your own 

risk.

Onkyo will not be liable and you will have no remedy for 

damages for any claim of any kind whatsoever concerning 

your use of the program or the accompanying online 

documentation, regardless of legal theory, and whether 

arising in tort or contract.

In no event will Onkyo be liable to you or any third party for 

any special, indirect, incidental, or consequential damages 

of any kind, including, but not limited to, compensation, 

reimbursement or damages on account of the loss of 

present or prospective profits, loss of data, or for any other 

reason whatsoever.

● Check that the unit is turned on, and the connection to 

the Internet is secured.

● Turn off the controller component (PC etc.) connected to 

the network.

● Stop any playing Internet radio, USB storage device, or 

server content.

● If the multi-zone function is active, press OFF on the 

main unit to turn it off.

● If "HDMI CEC (RIHD)" is set to "On", set it to "Off" 

(default value).

–  After pressing RECEIVER on the remote controller, 

press SETUP. Then, after selecting "6. Hardware" 

- "HDMI" and pressing ENTER, select "HDMI CEC 

(RIHD)" to select "Off".

¼

½

The description may differ from the on-screen display but that will not 

change the way to operate or the function.

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

1.  After pressing RECEIVER on the remote controller, 

press SETUP.

The Setup menu is displayed on the TV screen.

1. Input/Output Assign
2. Speaker
3. Audio Adjust
4. Source
5. Listening Mode Preset
6. Hardware
7. Remote Controller
8. Miscellaneous

Setup

1. TV Out
2.HDMI Input
3. Video Input
4. Digital Audio Input

2.  With the cursors, select "8. Miscellaneous" - "Firmware 

Update" - "Update via NET", and then press ENTER.

1. Input/Output Assign
2. Speaker
3. Audio Adjust
4. Source
5. Listening Mode Preset
6. Hardware
7. Remote Controller
8. Miscellaneous

Setup

1. Firmware Update
2. Initial Setup
3. Lock

● If "Firmware Update" is grayed out and cannot be 

selected, wait for a while until it starts up.

● You will not be able to select "Update via NET" if 

there is nothing to update.

3.  Press ENTER with "Update" selected to start update.

● During the update, the TV screen may go black 

depending on the updated program. In that case, 

check the progress on the display of the unit. The TV 

screen will remain black until the update is complete 

and the power is turned on again.

● "Completed!" is displayed when the update is 

complete.

4.  Press  ON/STANDBY on the main unit to turn the unit 

into standby mode. The process is completed and your 

firmware is updated to the latest version.

● Do not use  RECEIVER on the remote controller.