WiiM Ultra Firmware v5.2.739061 Update - Dec 18, 2025

Please review the WiiM Ultra update release notes below. If you encounter any issues, feel free to reach out to us. This firmware update is being rolled out in stages, with devices updating sequentially over the next few days.

5.2.739061 (In Progress)​

Release date:

Dec 18, 2025

Bug Fixes:

1. Multiroom: Fixed an issue preventing multiroom setup with some routers.
2. Google Cast: Fixed missing subwoofer bass output and EQ not working.

 

[hgo58]

Just started dreading how long the flash memory area could withstand so many updates.
Please, tell me I'm wrong.

Typical flash memory used for firmware can handle between 10,000 and 100,000 updates. Even the worst memory type can handle at least 1,000 updates. So no worry.

 

[DHvR]

I mainly use Plex playlists to play the music from my library.
Since the last firmware update:
- The Wiim Android and Windows apps are showing the wrong Kbps (16-bit/44.1kHz flac should be close to 1000kbps, only showing 200-300 Kbps)
- Many songs are not played fully. It skips to the next song half way through.
Both issues are new. I have been using Plex playlists for over a year now.
I also have a Wiim Mini (20251102). For the Mini the apps still show the correct Kbps and the songs don't skip.
Plex Server Version 1.42.2.10156 on Synology NAS

Happy to report that after raising a ticket through the Wiim app, support have reverted the firmwares on my problem devices (Ultra & Sound). Plex playlists with FLAC files now work again. They promised to work on a fix in new firmware.