If your B183F works, do not chase this. If it is broken, buy a new one on eBay for $40.
Sony has not released any firmware updates for the NWZ-B183F Walkman. This model runs on a fixed, embedded system that was finalized at production. There are no official update files available on Sony’s support site, and the device does not support user-applied firmware changes. sony walkman nwz-b183f firmware update
While there are no new feature updates, here is how you can manage the existing software and troubleshoot your device. Official Software & Tools If your B183F works, do not chase this
For the NWZ-B183F, the firmware that shipped with the device (or was distributed in the immediate years following its release) is generally considered the final, stable version. Sony typically releases firmware updates to solve critical bugs or patch security vulnerabilities. As of the last few years, Sony has officially discontinued support for the B-Series players, moving their focus to the High-Resolution Audio (HRA) players in the A, ZX, and NW series. This model runs on a fixed, embedded system
Before searching for updates, verify your device's current firmware: [Settings] Navigate to [Unit Information] to see the version number. helpguide.sony.net Common Troubleshooting Updates