Sony HT-A7000 Help Manual page 102

[Network Update]
Updates the software using the available network. Make sure that the network is connected to the Internet.
[USB Update]
Updates the software using a USB memory. For details on updating, refer to the instructions that are displayed when
downloading the update file.
[Wireless Speakers Update]
Updates the software of the optional subwoofer and rear speakers when the software of the speaker system is the latest
version.
Note
You can perform [USB Update] by pressing and holding the BLUETOOTH and
seconds.
If updating of the optional subwoofer or rear speakers does not work, move them to a location near the bar speaker and update.
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(power) button on the bar speaker for 7