Honeywell Lyric User Reference Manual page 56

Communication Module Replacement (continued)
1. With the system not armed, select Tools on the Security menu.
2. Enter the 4-digit Master User code.
3. Select Advanced.
4. Select Install Cellular Module.
Follow the on-screen instructions for changing the module.
5. Press OK on the screen in step 4. The system confirms installation.
6. Press OK. The system returns to the Advanced menu.
7. Reboot the Controller (see Reboot for details).
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