GUI upgrade not working (for me) from version 2.7. Also never been successfully upgrade via application shell (by admin).I using CLI root access for upgrading:manual download update from software.cisco.com./install.sh JeOS <jeos-update-file.zip>./ins...

I found a workaround, enable server connection via CLI. 

No. Please refer to Cisco Unified Communications 11.x and 10.x Licensing At-a-Glance https://www.cisco.com/c/en/us/products/unified-communications/unified-communications-licensing/at-a-glance-listing.html

For to associate user this jabber device you need Enhanced licence. But if you want associate user with two device (jabber and 7821, for example) you need Enhanced Plus licence, and Basic licence not be used. For associate 3-10 device to one user you...