Sony STR-DA3300ES Technical Bulletin page 6

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3-5-2. In the [ISP Utility File Dialog Box], click [Start] after confirming that the applicable amplifier is powered on.
3-5-3. The message "Entering debug mode. Please reset the board and press OK" will be displayed. Click [OK].
The upgrade will start.
3-5-4. It takes about 2 minutes to upgrade. Make sure not to touch the applicable amplifier and PC during writing.
The message "ISP successful" will be displayed when the writing is completed normally. Click the [ ] button on
the top right of the screen to close the program.
3-5-5. Power off the applicable amplifier, and disconnect the cable of the PC Communication Jig.
NOTE
If multiple upgrades need to be performed, only steps 3.1 and 3.5 of this procedure are to be repeated.
4. Version Number Confirmation
Refer to step 1 of this procedure for further details.
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Amplifier Initialization
Initialize the amplifier by performing the steps below.
1. Press [POWER] to turn off the amplifier.
2. Press [POWER] to turn on while holding down [TONE MODE] and [DMPORT] on the front panel.
3. "MEMORY CLEARING" appears on the display for a while. All memory is reset to the factory settings.
Do not use a "Super reset" in the "Special Menu Mode". If a "Super reset" is performed, also an "up convert
signal level adjustment" will be initialized.