Upgrade from 3.2 to 3.4, then upgrade to 4.0 and finally 4.2 thinking it would fix it.  I keep getting the frontend error:  

How do I just get the frontend upgrade????? Am I missing a package!

1.  The DB upgrade was good, did tail logs and it worked.

2.  i getting zabbix alerts just cannot get into front end

3.  Tried rebooting server, and reinstall again but everything is updated:

4.  Checked on config and php config and it has all my db name and unique password:

***UPGRADE TO 3.4

sudo rpm -Uvh https://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/[zabbix-release-3.4-2.el7.noarch.rpm|https://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-2.el7.noarch.rpm]

***UPGRADE TO 4.0

1.  rpm -Uvh https://repo.zabbix.com/zabbix/4.0/rhel/7/x86_64/zabbix-release-4.0-1.el7.noarch.rpm2. 

1. yum clean all

3.  # yum upgrade zabbix-server-mysql zabbix-web-mysql zabbix-agent Zabbix-web4.  systemctl start zabbix-server

***UPGRADE TO 4.1

sudo rpm -Uvh https://repo.zabbix.com/zabbix/4.1/rhel/7/x86_64/zabbix-release-4.1-1.el7.noarch.rpm

1.  sudo yum clean all

2.  sudo yum upgrade zabbix-server-mysql zabbix-web-mysql zabbix-agent zabbix-web

Database error

• The frontend does not match Zabbix database. Current database version (mandatory/optional): 4010004/4010004. Required mandatory version: 3020000. Contact your system administrator.