Sony SRS-ZR7 Help Manual page 237

4. Turn the speaker on.
The UPDATE indicator flashes and the update starts automatically.
The UPDATE indicator turns off and the speaker enters to the standby mode or BLUETOOTH/Network standby mode
automatically when the updating is completed. When you turn on the speaker for the first time after an update, the
UPDATE button flashes three times.
Hint
The number of flashes of the UPDATE indicator will change according to 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
When you update using a USB flash drive, the update cannot be stopped. If the USB flash drive is removed or the speaker is unplugged during the
update, the speaker will malfunction.
Updating normally takes 3 to 10 minutes.
Do not operate the speaker during an update. Also, keep the speaker connected to the power supply and network while updating.
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