Can Freelance Firmware Version 9.1 be loaded on AC700F PM 783F B2 ?
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You should have no problem with loading old firmware to newer hardware - most of later produced controllers are simply backward compatible. You should only wary when it comes to downgrading firmware from version 2013+ to 9.1. According to Product Bulletin 3BDD011838D0298 downgrading or upgrading directly between those versions is impossible.
Hope this helps,