Upgrading Flash Accel Host Agents
You can use the Flash Accel Management Console to upgrade Host Agents. You can upgrade the agent on a single host, or use a bulk upgrade to upgrade agents on multiple hosts.
Before you begin 
ESXi hosts must be in maintenance mode before you can upgrade Flash Accel Host Agents. All running virtual machines must be migrated to another host (either manually or automatically by DRS) or shut down. You can then right-click the host using the vSphere Client and select Enter Maintenance Mode.
Steps 
1.
From the Host Inventory page of the FAMC, click the wrench icon for the host on which you want to upgrade Flash Accel software and select Software > Upgrade.
From the Host Inventory page of the FAMC, select each host on which you want to upgrade Flash Accel software and click Host Agent Upgrade in the Bulk Actions area of the FAMC.
The host upgrade dialog box opens.
2.
Click Upgrade.
The Flash Accel Host Agent is upgraded on the host.
3.
After you finish 
Power on the VMs, or if you moved them to another host, migrate them back.
Parent Topic: Upgrading Flash Accel components