Sony ULT FIELD 1 Help Manual page 61

"XXXX" displayed under "ULT FIELD 1" indicates the software version.
Hint
When a software update fails, turn off the speaker and then turn it back on. The speaker will recover from the error state.
For details on activities of the indicators on the speaker pertaining to software updates, see "Other activities of the indicators
(indications pertaining to updates to the pre-installed software)" in
Note
When an attempt to update the software fails, charge the rechargeable built-in battery until it is charged 40% or more. You can
view the remaining power of the rechargeable built-in battery on "Sony | Music Center."
Related Topic
Charging the speaker
About the
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61
indicators.