Uninstall a Software Update Patch
During the install-patch processing, the original files were saved under the directory patches/save/ in a backup file that has .undo in its name.
There is currently no automatic process to uninstall a patch using those saved files. The files are there, and you can use them to restore to the previous version that was there when the software update patch was applied. This step is done manually, copying the files back into their location.