RC4 firmware 'upgrade'

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Hi Lads,

Does anybody know or have a copy of the 'old' firmware from an RC4 decoder?

or know of a way to take the existing firmware off an RC4?

Our members still use MRT transponders & we still use the old skool handout transponders so won't be upgrading the firmware BUT if we need to replace the RC4 it comes with the new super 'improved' firmware.

Any advice welcome