IAG update roll back and Whale Backup
In case you run in to an regression or instable behavior after upgrading to a new built , then follow these steps to roll back and get on the previous built immediately.
1- Under C:\Whale-Com\e-Gap\patchdb\unistall-last.bat
2- Just run this bat file and it will uninstall the update for instance if you want to uninstall just Update 3.
3- Wait till the installer confirms that its rolled back successfully
4- Reboot.
Also please ensure that you take full back up of IAG server before upgrading it to new built / latest built by using whlbackup utility only and not just Configuration export from whale console.
Its documented on TechNet --> https://technet.microsoft.com/en-us/library/dd278145.aspx