Complete

Published app doesn't update or install on some devices

I started getting a lot of reports that my "Universal App" doesn't update for some users. If they delete it, they can't install it back. The app doesn't use Garmin Pay.

I updated the app with the most recent SDK and published an update - it was accepted without any issues. However, when I tried updating it on my watches, one of the watches had exactly the same issue as other users. On Fenix 8 AMOLED, the update was queued forever. When I uninstalled, I couldn't install it back - it would say "installing", then briefly "settings", then back to "install". In log file I found a bunch of these:

---
Error: 'Signature check failed on file: DB1A9BFA'
Time: 2026-05-03T01:40:38Z
Part-Number: 006-B4536-00
Firmware-Version: '21.39'
Language-Code: eng

What is weird, is that this app updated on my other watch Enduro 3 without any problems. Same user account.

Same thing happens to my other app (HYDRATE+), except that watches switched (installs on Fenix 8, but not on Enduro 3). Users complaining too:

The Connect IQ user A Mr has sent you the following request regarding your app "HYDRATE+":

hi, I can't get it installed. IQ just says installing and then the button us reseted. any suggestions?
THX!
MobileDriveway

  • We're actively working on this one—it's reproducible but we're still gathering information.

  • Is there a way to set an app to "private" while this bug is still pending? Currently I'm receiving plenty of complaints about this issue from users who can't update/install. It would be nice to not have on-boarded users exposed to this issue and potential new users suffer through the following update-loop.

  • My device is a Forerunner 955 running firmware 27.09.
    It’s definitely not just a widget issue; it seems like a deep-rooted problem on Garmin's side. I am the developer of two music apps, AudiobooksOrange and AudiobooksGreen. Both share the same codebase and functionality, and both are built on the same machine using the same SDK.
    However, while 'Orange' installs without any issues, 'Green' does not. I can install it via Garmin Express and even access the settings immediately after installation. But as soon as I disconnect the watch from the computer, the app disappears from the device, leaving the following log:
    Error: 'Signature check failed on file: G55E3855'
    Time: 2026-05-05T14:39:23Z
    Part-Number: 006-B4024-00
    Firmware-Version: '27.09'
    Language-Code: rus"
  • in reply to VAW.BE

    As I mentioned, my 2 watches and 2 apps did a criss-cross - one app doesn't install on one watch, and second one on another. So, it is definitely not firmware.

  • To help team Garmin debugging this: I don't think this is a watch firmware issue but something on the ConnectIQ Servers, as I'm still able to sideload widgets on my Venu 4 for example. I'm aware the newer models only have apps, music, data fields and watchfaces as app type (not widgets), but widgets were always still converted to apps automatically for the newer devices. This allowed us to support older models and newer ones in the same appid.