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.
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.