Aqara Smart Lock U400 – Latest Firmware V3110（May 8)

amfca · May 6, 2026, 8:39pm

I will also chime in here and hope this is fixable. I currently have the need for UWB to always function in a multi door/lock scenario. I have a side entry door into the garage, a garage entry door into the kitchen, and of course a front door. Very frequent entry and exits to all doors and UWB “Should Just Work” in these cases without these scenario limitations stated above

The Halo Bros · May 7, 2026, 3:56am

I’ve contacted Samsung a few times today through different channels and I’m being told that there are certain versions of the Samsung Digital Key Framework and Google Play Services needed to use UWB for door locks. I can confirm that I have versions that exceed the minimum yet I don’t have UWB. One of the individuals told me that a firmware update on the lock may be needed to enable UWB as well as repairing the lock to the ecosystem. Could anyone provide a timeframe for when this will happen, in Samsung’s footnotes it states April 2026.

KinseyCreateGoods · May 7, 2026, 4:00am

amosses:

I’ve identified a specific and reproducible UWB unlock bug that I wanted to share with the community and Aqara team.

The Issue:

UWB approach-unlock works fine in most scenarios, but fails consistently in one specific case:

I enter my home through the front door (where U400 is installed) - UWB works as expected ✓

I exit through a different door (garage, side door, etc.) while staying on the property

I return to the front door and approach - UWB does NOT trigger the unlock ✗

Interestingly, it works in these scenarios:

Exit through the same front door you entered → UWB works on return ✓

Exit through a different door BUT leave the property entirely (drive away, etc.) → UWB works on return ✓

Apple Watch tap-to-unlock works fine in all scenarios, including the failing case ✓

Testing:

Reproduced consistently on firmware 3104

Still present on beta firmware 3.1.1.0

All other lock functions work normally (fingerprint, keypad, Apple Watch, etc.)

This limits the usefulness of the UWB feature when you have multiple doors on your property, which I’d imagine is fairly common for homes with garages or side exits.

Has anyone else experienced this? @KinseyCreateGoods or team - is this on the radar for the next firmware update?

We’re currently looking into a proper fix for this issue.
Right now, a quick workaround would affect battery life on both your phone and the lock, so we’re working on a smarter, more optimized solution instead.

KinseyCreateGoods · May 7, 2026, 4:04am

From what I understand, Samsung phones currently only support Aliro NFC; their UWB function hasn’t been launched yet.

Aqara’s UWB already supports both Aliro 0.9 and 1.0 protocols, and firmware V3104 / V3110 are both full versions with complete UWB support.

amosses · May 7, 2026, 5:08am

Kinsey - Thank you for the update!

bsem1 · May 8, 2026, 2:27am

For me the Aqara app does not show the V3110 update. I have my lock setup using Matter in Apple Home, and then from there in Home Assistant. It shows update in Home Assistant but not in either Aqara app or Apple Home. Is there something I am missing? Is it safe to do the upgrade in HA ?

KinseyCreateGoods · May 8, 2026, 8:44am

V3110 has passed the Matter and Apple Home certification tests and is now in rollout phase.

Aqara Home users can download and update via the Aqara Home app. Currently we are releasing the update in a gray-scale rollout, with only 20% of users eligible to receive it. The full official release is scheduled for May 22nd.

In addition, the official firmware has been uploaded to Matter. Updates are expected to be visible on all compatible ecosystems within these few days, though the release timeline may vary slightly across different platforms.

bsem1 · May 8, 2026, 5:03pm

Thanks for the update which explains why I do not see on the app. My lock is working perfect, so I will wait until I can install from the app because I heard it is much faster.