BIG-IP : upgrade fails to transfer configuration

UPDATE: I created 11.4.0 archive , downloaded .ucs file , switched to 11.4.1 , uploaded .ucs , and attempted restore :

Operation Status Saving active configuration... Unexpected Error: Configuration cannot be saved unless mcpd is in the running phase. Save was canceled. See "show sys mcp" and "show sys service". If "show sys service" indicates that mcpd is in the run state, but "show sys mcp" is not in phase running, issue the command "load sys config" to further diagnose the problem. Error backing up current configuration. Product : BIG-IP Platform: Z100 Version : UCS : 11.4.0 System: 11.4.1 Edition : Final Hostname: myf5 Installing --full-- configuration on host myf5 Installing configuration... Installing the license file... ATTENTION REQUIRED: Your previous configuration files have been archived, as listed below. If you customized any settings in these files before upgrading, you will need to manually restore those changes by using the Configuration utility or Traffic Management Shell (tmsh). Archiving /config/wa/pvsystem.dtd.11.4.0 Archiving /config/wa/pvsystem.conf.11.4.0 Archiving /config/wa/globalfragment.xml.11.4.0 Post-processing... Reloading License and configuration - this may take a few minutes... Configuration loading error: base-config-load-failed For additional details, please see messages in /var/log/ltm

WARNING: There were one or more errors detected during installation. Check the error messages and take the proper actions if needed. ERROR: UCS installation failed. Operation aborted. /var/tmp/configsync.spec: Error installing package Config install aborted. Unexpected Error: UCS loading process failed.