How to Rollback the upgrade farm build version?

Question

I installed the CU Updates of the August, then run the command of Upgrade-SPFarm command after that my schema version changed, so I can't deploy any solutions in visual studio. I need to rollback the process.

Answer 1

There is no safe rollback path. That is reason we should always backup before applying major changes to the system.

Answer 2

You cant roll back a CU as it upgrade not only the File System on the SharePoint Server as well as upgrade the Databases.

Options, you have to troubleshoot the issue what is casuing the issue.

• Open a Support Ticket with MSFT to solve the problem.
• Examine the Upgrade logs, ULS logs to find any clue.
• I would Run the Configuration Wizard on All Servers
• Still having the issue then try to clear the config cache.

Lastly you can restore from a farm backup, which required a lot of efforts as you have to rebuild your farm.