How do I downgrade my iPhone4 CDMA 4.2.10 to 4.2.8?

When posting the info for the Q, it was noted my iOS of 4.2.10 is not even listed in the "Select OS" drop down.
For all the reasons you can think of, I would like to gain the knowledge of and get my Verizon iPhone4 out of iOS 4.2.10. iOS ver 4.2.8 worked nicely, everything was sweet until, through my stupidity, I alllowed the auto update of 4.2.10.
I would ask help, but in this case; H E L P

Sorry, downgrading iPhone software is not supported by Apple, thus there is no official way to do so.

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How do I downgrade my iPhone4 CDMA 4.2.10 to 4.2.8?

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