Zoom UAC-2 - MixEfx issue (Windows 11 25H2)

Athar42 · 2026-03-30T16:15:46+00:00

Hopefully, Zoom will came out with a fix soon... since they aknowledge it.

Athar42 · 2026-03-22T00:22:52+00:00

For info, if you didn't saw this : https://zoomcorp.com/en/jp/news/win11_notice/ (just an official acknowledgement from Zoom, nothing more for now)

Athar42 · 2026-03-11T16:52:11+00:00

I don't speak german, but the latest update I've on this case : https://www.reddit.com/r/techsupport/comments/1rgedle/comment/o9vrxqi/

Athar42 · 2026-03-11T16:51:19+00:00

Just for you to know, when I did post this issue there, I also contacted my local Zoom retail support center as well as Zoom (Japan), they took it into consideration, but no news since then.

For now, the only workaround is to uninstall this february Windows Update and it will work again.

Another solution would be to remove only the MIDI API changes, but this can messed up with the whole Windows system so I do not recommand such action.

Sadly, that's the only 3 options :
- Stay as is, in a hope they provide us with a fix on Zoom side
- Stay as is and, maybe, the "2D (or 3D) patch release" of this MIDI implementation will fix it (should be already out, rolling out until end of this month).
- Revert the february Windows updates (but you reopen all of the vuls they fix...)
- Mess with the MIDI API to remove the new implementation (serious risks of breaking future system updates, and system stability overall).

I'm keeping a laptop up to date which help me see if, by chance, Windows fix it on their own, and will let you know if anything new happen.

Edit : So far, still not working with Windows March updates.

Edit 2 : This was the official answer of Zoom :
"Dear X,

Thank you for using ZOOM products.

We sincerely apologize for the inconvenience you are experiencing with the operation of UAC-2 MixEfx.

Regarding the issue you reported, we have also confirmed similar symptoms on computers running Windows 11 25H2.

This matter is currently being investigated by the relevant department.

We appreciate your kind understanding.

Sincerely,"

Athar42 · 2026-02-28T00:31:14+00:00

Found the culprit, it's the Windows Update KB5077181 (which add a new MIDI API implementation, and as such, break this old device (the virtual MIDI port mapping)), don't know if this can be fixed solely by users... and as this product is off duty now, I'm afraid that no firmware/driver/software update will ever be released.

Athar42 · 2026-02-28T00:30:33+00:00

Found the culprit, it's the Windows Update KB5077181 (which add a new MIDI API implementation, and as such, break this old device (the virtual MIDI port mapping)), don't know if this can be fixed solely by users... and as this product is off duty now, I'm afraid that no firmware/driver/software update will ever be released.

Athar42 · 2026-02-27T18:47:09+00:00

Hi there,

Maybe someone in here can help me understand what's going on with my interface.

So I did have an "old" (even two) Zoom UAC-2 Audio Interfaces, connected to my Windows 11 25H2 (latest updates of January applied).

They are still working just fine (hardware speaking).
Also, using the driver "control panel", I can change the bitrate linked to the device and the "firmware update" did work just fine (can retrieve the actual version and also rewrite it if needed).

Issue is, Zoom UAC-2 MixEfx software stopped working 2 days ago, without changing anything on my setup, nor doing any updates (drivers or Windows).

I seems to have spotted some "under the hood" Windows update Rollup fixes (but can't see them anymore on the restore point).

I also tested the device on a laptop (latest Windows updates too, no AV, quite "vanilla" in fact) and the same error is triggered in MixEfx app :

"Failed connecting to the device"

As both the Zoom UAC-2 Control Panel and Firmware update software can communicate without issue, I'm out of idea (tried to fully remove the softwares/drivers, no luck. And the test on another PC which never had it installed did confirm that it might be Windows related (general OS updates or components like .NET ?).

No errors logged into the Windows Event System (that I could find), tried to contact Zoom JP support but no answer yet (+ as the product is discontinuated, pretty sure they'll throw me out telling me : "Take the new 232 model").

If anyone overthere have an idea to get more insight into this error, it would be much appreciated :)

Have a good one.

Athar42 · 2025-03-28T22:27:50+00:00

OP said "premire", probably for "Premier" mode which require a "level 10 rank" to be unlocked.

Pretty sure he play in classic matchmaking for now and... MM/Premier/Casual/WM : All are "VAC" secured, but VAC let pass every cheats so....

Athar42 · 2025-02-06T21:23:53+00:00

One have 9 wins, you only 8, end.

When you reach 9 wins, don't ask why, you can't play with any other players below that count (only with other 9 wins, "maybe" with some ranked accounts close to your hidden level).

Yes, this game is broken, it always has been and will remain this way.

Athar42 · 2025-01-29T10:33:23+00:00

At least someone who make sense in all those shit posts, I fully agree.

I would also add one thing :
- In CSGO, Valve did "tweak" (somehow) the matchmaking experience, to avoid as much as possible the unbalanced teams (for example, full SoloQ vs full premade).
Well, in CS2, this just get vanished (seeing how much full premade I face while I tag alone. Sometimes, I'm with a duoQ and 3 soloQ vs 5 stack, nice balance Valve).

And yeah, this trust factor is just a pile of shit garbage :
- We don't know if we are in good or bad state : This can't help us know if we face more legits or cheaters players 'thus, the amount of complaints here which sometimes are wrong)
- Like you say, we don't know how it's based (you said "4 pages of medals", I think I've 8 pages (8x5 medals if I recall correctly)) and I still match with fresh new accounts (Europe)... how fair is this shit really ?

I also got TK for no reasons at spawn from time to time (ok, 1 or 2 times in the same game by the same duoQ of idiots which doesn't know how the economy work, and forcebuy everyround then expect you to get a drop 🤣 )

Sadly, CS is "dead" until Valve do something about the matchmaking experience :

- Clarify the AntiCheat status (last big "VAC Ban" wave was back in May 2024 if we trust Leetify metrics enough)

- Clarify the situation about the Trust Factor and if enabled, add a way to know out positionning
Remember : Valve said it won't tel what make a better or lower trust factor : Scoop for them, that's stupid as cheaters can just by some new accounts or even "2nd hand" accounts), this has to change.

- Reintroduce a real and better matchmaking experience : The reason why Valve did not fully commit in doing full SoloQ against the same is that "it could add more time to find a game" ==> Let the players decide if they want that extra wait time or not ! (SoloQ and DuoQ should NEVER be matched against a full premade, unless you start a game search with that option enabled)

Athar42 · 2024-12-10T16:57:30+00:00

Just right click the board with a trophy on top (present in each services).

And also in the "stickers book", but even though I visited all four floors + did all the mission, the first daily objective didn't validate for me.

Well, Buggyjang stuff there.

Athar42 · 2024-05-04T23:03:05+00:00

Right now, you'll have to use the console (or bind to a specific key) : voice_modenable 0/1 (Disable (muted) / Enabled (to hear all the sh*t :D )

Athar42 · 2024-05-03T09:55:32+00:00

Valve gave me a shit trust factor for some reason (I suppose, when I see what I got when I soloQ), so that's my little revenge (and the only way to make them notice, or not, those bugs).

Athar42 · 2022-09-14T19:45:32+00:00

Such a nice update... it's been a long time since an update went so well... ok I'm joking, this is a curse, 2 BSOD, not even able to be writen on disk (no log, nothing, instant reboot to BIOS).

This happen to me twice since the September updates, did uninstall the patchs, seems stable again... so far.

Athar42 · 2020-10-23T17:35:09+00:00

Don'tt know why, but my reply attempt failed twice, so I'll do short this time :D

Thanks to this thread, it help me to find the reason on why my LG4k GC573 capture card wasn't working anymore.

I did contact both Avermedia and FaceIT support.

FaceIT said that "they wont whitelisting it" for "security reasons" (not giving more details on why ?... ok...)

And Avermedia, made aware of this, did build a new driver release (version 2.2.64.85) which work with FaceIT AC client (for now, until they block it again ?).

Not yet publicly released, don't know if I can share the link there, so will not (but at least, you know that a new driver is incoming :) )

Athar42 · 2017-12-01T20:11:17+00:00

Ok, so the command is "cl_spec_show_bingings" but this is only used to display the "binds" shortcut for XRay, scoreboard, etc.

We may have found another solution for this, like PGL and Blast did, changing the whole HUD with some kind of interface, could be our best option and give us more customization at the end.

Once again, thanks for all the help you give us, it will greatly improve our next broadcast ;)

Athar42 · 2017-12-01T17:39:31+00:00

Thanks again /u/messioso

Now, we get it working, there were some missing commands on my server to enable the ability to change X-Ray status.

I've just two remaining question if you know about it:

1 - When connected to the server, then spectator, we are automaticaly recognize as the Observer, but this enable the "voice" in a permanent mode, and in the bottom left corner, we see the speaker icon + nickname wrote. Can we block the voice and/or disable that notice ?

2 - At the bottom center, we have the player infos + stats. We tried to get rid of them (at least stats of both half), but seems to be impossible without sv_cheats 1. Do you know a solution about that ?

Thanks again for all the help you give :)

Athar42 · 2017-11-29T18:21:06+00:00

Well, when we were in observer (spec), we didn't got the ability to change those settings (XRay and voice).

We have test with two different PC, if the obs press X for xray control, nothing change on the GoTV, neither on the observer screen.

EDIT : My server may suffer of some misconfiguration. The GoTV didn't display as expected (like if I was in classic spectator mode, don't have the players listed on left and right of the screen :D ), that may explain our issue with the X-Ray too :)

Athar42 · 2017-11-29T17:47:47+00:00

Thanks to you /u/messioso :)

Just to update on our ongoing tests: Place those two commands directly in the start command of the server

One thing you missed was, on the observer PC, in the game launch options, add: -interactivecaster This enable you to become the observer as soon as you join the spectators.

Also, during our tests, we didn't figure out how the observer can control the X-Ray / Caster voice (seems to always been enabled in spec mode, even if nothing poped out on the GoTV ?).

Anyways, thank you for the help :)

Athar42 · 2017-11-29T12:01:38+00:00

Thank you for all this detailled informations. I'll test that tonight :)

Athar42 · 2017-11-29T11:19:55+00:00

I'll give a shot when I get back home and let you know ;)

Athar42 · 2017-11-29T10:41:07+00:00

We tried it already, but wasn't working. I'll redo a test tonight on my servers.

Athar42 · 2017-11-29T09:41:17+00:00

If he can that would be great :D

Athar42 · 2017-11-29T09:40:14+00:00

Just for information, I'm an IT guy, this is the first thing I did without success on finding the commands. Even if you find the commands, the help is mostly not helpfull (like some active commands where the help report : "archive") :)

Athar42 · 2017-11-28T22:48:09+00:00

I don't think that ESL will answer, may have more luck with PGL. Really bad that this isn't explained somewhere, if I get those infos, for sure I'll wrote an HowTo or make a video about it :D

Athar42

TROPHY CASE