How to downgrade CRS from 10.2.0.3 to 10.2.0.2

Hi Gurus,
I am in the process of upgrading 10.2.0.2 to 10.2.0.3. So far things are going smooth. However, I want to have a rollback procedure ready in case anything goes wrong.
Maybe I am not looking good enough, but I am having tough time finding document on how to downgrade crs in case of human errors during upgrade.
1) Has anyone downgraded the CRS? If yes, does it cause any startup issues after downgrade?
2) Does anyone know a metalink note id which explains the steps to downgrade CRS?
Thanks a bunch.
--MM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

AFAIK, there is no supported way to downgrade the CRS from 10.2.0.3 to 10.2.0.2. You may have restore from the backup (including voting/ocr devices and other config files under /etc).

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