Sony NW-A45 Help Manual page 118

If you execute [Restore to Factory Configuration]/[Reset All Settings], pairing information for Bluetooth devices will be deleted
from the Walkman.
If you rebuild the database, the following information will be erased.
Elapsed time of the selected track
Playback order
The contents of the Help Guide may be subject to change without notice due to updates to the product's specifications.
Related Topic
Restarting the Walkman
Formatting a microSD card
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