Previous ZBX DB version: 02050069
Current ZBX DB version: 02050071

Frontend dont open with message:
"The frontend does not match Zabbix database. Current database version (mandatory/optional): 2050071/2050071. Required mandatory version: 2050069. Contact your system administrator."
The Zabbix_server version is:
zabbix_server (Zabbix) 3.0.0alpha5
Revision 56596 10 November 2015, compilation time: Nov 10 2015 06:52:05
"
Copyright (C) 2015 Zabbix SIA
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it according to
the license. There is NO WARRANTY, to the extent permitted by law.
"
The zabbix_server.log show the upgrade to 02050071 DB Version... but the frontend source code need version 02050069.