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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
Parents
  • 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"
Comment
  • 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"
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