If an ION8500 has firmware version v280, it means that it is a RevB meter. This meter has be repaired with parts an ION 8600, which is why it has the unique "RevB" firmware.
All attempts to downgrade this meter to versions lower than v280 (using ION Enterprise or ION Setup) will fail.

Last Revised: November 23, 2007
Applies To: ION 8500
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Legacy KB System (APS) Data: RESL189623 V1.0, Originally authored by KBAdPM on 11/24/2007, Last Edited by KBAdPM on 11/24/2007
Related ranges: ION Setup 2.0, ION Setup 2.1, ION8500