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How to manual downgrade the firmware version on a Shoretel 220t1a

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I have two 220t1a one has firmware version 19.47.5900.0 this is the main system that is online, I have a back up of the same model 220t1a on firmware version 22.18.4600.0
I would like to take the backup from the 19.47.5900.0 and put it on the new one which has the version 22.18.

Would it work off without having to worry or should i attempt to downgrade the firmware if possible.

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