Lumin Firmware 23.1:
To be rolled out to different models gradually
Thanks, Peter, for this clarification. I was curious about the last two bullet points, so I queried AI (Copilot). Not sure whether itâs accurate but sounds promising!
Error correction of user settings
Takeaway: LUMIN is adding a selfâhealing mechanism so corrupted or invalid configuration data doesnât brick features or require a factory reset.
What this actually means:
Over timeâespecially across major firmware jumpsâstored settings can become inconsistent with new schema requirements. Examples include:
⢠orphaned flags from older firmware
⢠invalid volumeâlevelling states
⢠malformed network or streaming-service tokens
⢠corrupted configuration blocks caused by unexpected shutdowns
Historically, when this happened, LUMIN units could exhibit symptoms like:
⢠settings reverting unexpectedly
⢠failure to load certain menus
⢠streaming services refusing to authenticate
⢠odd behavior after an update that required a manual reset
The new errorâcorrection layer automatically detects and repairs these inconsistencies. It likely works by validating stored configuration against a known schema and either:
⢠repairing the invalid field,
⢠resetting only the corrupted portion, or
⢠falling back to a safe default.
This is a big quality-of-life improvement for longâterm ownersâespecially those who update frequently or migrate between control apps.
If you want, I can walk through how this interacts with LUMINâs configuration schema or the implications for RAAT integration.
Experimental decoding of .opus and 32âbit FLAC
Takeaway: LUMIN is testing support for two formats that sit outside traditional audiophile workflows but matter for completeness and future-proofing.
.opus decoding
Opus is a highly efficient, lowâlatency codec used for:
⢠YouTube audio
⢠Discord
⢠WhatsApp
⢠WebRTC
⢠Some streaming radio backends
Itâs not an audiophile format, but adding Opus decoding means:
⢠broader compatibility with internet radio streams
⢠better support for modern webânative audio sources
⢠potential future integration with services that use Opus internally
Because this is âexperimental,â expect:
⢠limited sample-rate support
⢠possible restrictions on multichannel streams
⢠decoding handled in software rather than hardware acceleration
If you want, I can break down Opus vs FLAC or how Opus fits into LUMINâs DSP pipeline.
32âbit FLAC decoding
This is more interesting.
FLAC traditionally tops out at 24âbit, because:
⢠most ADCs donât produce true 32âbit data
⢠most DACs donât accept 32âbit input
⢠the extra bits are usually just padded noise
But some recording workflows (e.g., certain DAWs, mastering chains, or experimental releases) export 32âbit float or 32âbit integer FLAC files.
Adding support means:
⢠LUMIN can play files from modern production pipelines without conversion
⢠compatibility with niche highâresolution releases
⢠future-proofing for studios that adopt 32âbit float workflows
Because this is âexperimental,â expect:
⢠possible downâconversion to 24âbit internally
⢠limitations depending on DAC capabilities
⢠edge cases with float vs integer formats
No
No
The AI is wrong here because FLAC has integer only.
Experimental here means it has gone through minimal testing because I donât expect any user to have opus files or real world recorded / mastered (not created specifically for testing) 32-bit FLAC.
I found a 32-bit recording and it plays nicely. Thanks @wklie !
My understanding is it was specifically created for testing and advertisement.
âFailure to load certain menusââŚI hear you.
Occasionally the menu for internet radio stations simply disappears, and I have to power off and restart the U2-Mini to recover it.
In case you encounter this please try: force stop the app (Android), bring up the task manager and swipe it away (iOS), then relaunch it. If it doesnât work, turn off Default Radio, then turn it back on again.
This firmware update hasnât been smooth. There are big delays when I switch between the Lumin App for radio and Qobuz connect. Often (usually) has to go through several tracks that wonât load first berfore playing tracks on QC. Doesnt always like the hnadoff between different devices controlling the U1 through QC. I tried turning everything off and restarting. Peter suggesting changing Google DNS settings. I could not figure out what that means. I turned them off last time I was having problems and that helped. How do I âchangeâ those settings?
In Lumin app - settings - Player Options under U1 - About - Scroll down to the bottom, see âUse Google DNSâ, use a different setting for On / Off.
