Updating asterisk 10.11.1 to 10.12.1 in FreePBX distro

I have two installed FreePBX distro with the same modules, but asterisk’s versions are different. First system is 10.11.1 (production system) and second one is 10.12.1. I want to use second system for backuping the main system using Frepbx backup modules.
Unfortunatelly I don’t understand how I can update asterisk on production system to version 10.12.1.

I will be gratefull for any help.

This is documentation on how to upgrade in the Wiki. Look in the COMMUNITY menu above for Wiki or the links at the bottom of this page.