Can I switch back to my iPhone 12 from iPhone 14?

“Switching back to older phone from newer 

Can I switch back to my iPhone 12 from a 14?”

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Downgrading to a Different iPhone:

You'd have to do so manually(ie cloud storage), or through Quick Start. Note that not all apps would may transfer(due to incompatibility and device restrictions). IMPORTANT: For Security and Compatibility, update the old iPhone to the latest-compatible update.

If you are asking about moving data on the iPhone 14 or using a backup of the iPhone 14 to move data back to the iPhone 12......the answer is "yes"......IF.....the iPhone 12 is running the same iOS version as the iPhone 14.

For example, if your iPhone 14 is running iOS 18.3.1......the iPhone 12 must be running iOS 18.3.1 or it must be updated to iOS 18.3.1......before.....you transfer the data from the iPhone 14 back to the iPhone 12.

Yes, you can. But if you want to move your data from your iPhone 14 back to your iPhone 12, the 12 MUST be on the same iOS version as your 14.

Did you wipe the 12 when you moved to the 14? Does it open to the Hello Page?