Firmware Update to version 4.00.02 for NW-ZX500/NW-A100 series

Sony has released a new update for the A-Series and ZX-Series Walkmans. The firmware update brings the models up to 4.00.02. The following models are supported:

• NW-A100TPS
• NW-A105
• NW-106HN
• NW-ZX507

Here are the new updates:

• Adds support for the 360 Reality Audio service
• Provides Security Updates (The security level displayed in the Settings menu will be as of October 2020)
  

Note: The 360 Reality Audio service may not be available in all countries or regions.

I think I missed the earlier update as well, the last one I posted was from May 2020. So here is a list of what else is included in this new update from the previous update:

• Adds support for DSEE Ultimate (when using Music player)
• Enables sound adjustment during Bluetooth output
• Provides Security Updates (The security level displayed in the Settings menu will be as of September 2020)
• Adds support for Hi-Res streaming (May 2020 update)
  
• Adds a Bookmarks function to the Music Player app (May 2020 update)
• Adds a Keyword Search function to the Music Player app (May 2020 update)
• Fixes an issue where the playback speed becomes slow on certain M4A format content (May 2020 update)

The rest of the improvements are the same to this update from March 2020. I do not expect this update to improve battery life much, again, fault of Android, it is a power hungry OS version Sony's own OS they had on the older Walkmans. 

It is interesting to see DSEE Ultimate support, this confirms/indicates it is software based and could potentially be added to other devices if Sony wanted to add it. Only issue is, perhaps the DSEE Ultimate code/algorithm requires a more powerful SoC, along the lines of the one found in the new A and ZX walkmans.

Thanks Romo for the information about the new firmware.