Sony SRS-ZR5 Help Manual page 211

Hint
The number of flashes of the UPDATE indicator indicates the update's progress. The UPDATE indicator flashes four times at first, and decreases
by one flash, then turns off when the updating is completed. Do not turn the speaker off during the update.
Note
Updating normally takes 3 to 10 minutes. It may take longer depending on your network environment.
Do not operate the speaker during an update. Keep the speaker connected to the power supply and network while updating.
While updating via the Internet, you can terminate the update procedure by holding the UPDATE/WPS button when the UPDATE indicator flashes
four times. (This is not always possible.) If you cancel the update, the UPDATE indicator will stay lit again.
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