From the Pioneer website today. Updated 04/13/2011http://www.pioneerelectronics.com/PU...K?tab=firmware
- Fixes audio noise or no sound under certain conditions.
This required firmware update fixes a DSP software bug found in the Pioneer VSX-1021-K AV Receiver. When the receiver is connected to a 5.1 channel system (no surround back speakers) and a particular configuration of audio source and surround sound mode is used, the receiver may emit unwanted noise. If your unit does not have the above firmware version, the update should be installed regardless of the speaker setup.
Not all units need this update. There are two methods to determine if the unit already has this firmware version:
If there is a black O next to the serial number on the outside of the packing box, your unit is current and no update is required.
Check the unit's current firmware version.
Press the RECEIVER power button to switch the unit on.
Press the button and then the "Home Menu" button.
From the "Home Menu" screen, select System Setup and press the ENTER button.
Select "Other Setup" and press ENTER.
Select "Software Update" and press ENTER.
Select "Check the version" and press ENTER.
The current firmware version will be displayed on the TV screen and front panel display. If the firmware is not Ver. 1-151-081-111-031, you need to install the update.
If you need to install the update, click here to go to the update page.