as far as i can tell so far
if you have a V2.0 V2.1 or extreme stock and a V3 you can use V3.1 latest software
but you will have to reflash your LCD programmer via laptop or pc each time you change from v3 to others
i do of course stand to be corrected by the experts on here
just what i have found so far by downloading v3.1 after being prompted by an update
regards Fid
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