Users of the Lyric Alarm System with an LYRICLTE-A AT&T LTE Communicator installed take note. Resideo has identified an issue where, after the AT&T 3G sunset on 02/22/22, any panel not properly updated will lose its connection with the cellular network. This issue does not affect Verizon units.
The firmware version that resolves this issue is 01.09.07772.494, and it is available now on the Resideo AlarmNet360 servers. The issue at play here is that the AT&T cellular communicator currently falls back on the 3G network when it can't connect to LTE. Once an LYRICLTE-A communicator is registered, it looks for both an LTE signal and a 3G one. Without this critical firmware update, these communicators would continue to look for a 3G signal after the 3G sunset. Being unable to find a 3G signal, they will lose connection and go offline.
Users who find themselves in this situation have a few options. If you are a Lyric Alarm System user with the AT&T LTE communicator installed, you can choose to go ahead and manually update your system now. The system needs to be disarmed and have no trouble conditions present in order for the firmware update to go through, so a manual update allows you to choose a time when it is disarmed and ready. It also allows you to confirm that the update was successful after you see your panel reboot.
Since this is a critical update, AlarmNet will begin automatically updating panels that are affected by this issue starting on December 8, 2021. Since a firmware update can only go through when the panel is disarmed with no troubles, any users with a zone trouble, or a low battery message that they have been putting off correcting, should go ahead and take care of the issue. Once all trouble conditions are clear and the system is disarmed, we recommend that you go ahead and manually perform the firmware update. Instructions for updating are linked above.
If your system is automatically updated, it will reboot as part of the update process, so don't be alarmed if you see this happen. Step 3 in the FAQ on updating the panel linked above shows you how to confirm the panel's firmware version. So, if you see your panel reboot you can verify that an update was successfully completed.
Any Lyric Controller with a LYRICLTE-A AT&T LTE Communicator that is being installed on or after 02/22/22 will need to be updated to firmware version 01.09.07772.494 via the built-in WIFI communicator before the LYRICLTE-A will work properly. The firmware update should be completed prior to the installation of the LYRICLTE-A. The LYRICLTE-V Verizon LTE Communicator is not affected by this issue. You can read the full notice from Resideo here.