How to downgrade from osx 10.10.3 to 10.10

I recently updated osx as part of the Yosemite beta program and it stopped my computer from being able to start up, having completed a temporary fix and removing myself from the beta program i want to downgrade as quickly as possible. Is there any way to do this?

Just stop using the startup drive you configured for the beta and use your drive which still has 10.10 on it. You did set up the beta on a new drive or partition as advised by Apple, didn't you?
If not, restore from the backup you made prior to starting the Beta program.
If you did neither, there is no way to return your system to 10.10.0

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