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The Firmware (FW) release dates for these meters are as above. Please note that, FW numbers starting with 2 belong to 8300/8400/8500 series where as numbers starting with 3 belongs to 8600 series meters and dates are in MM/YYYY format.
v231 and v232 ==> 2002 - last quarter (Exact month information is not definite)
v240 ==> 08/2003
v244 ==> 08/2004
v260 ==> 01/2005
v261 ==> 04/2005
v262 ==> 09/2005
v264 ==> 04/2007
v280 ==> 09/2007
v281 ==> 12/2007
v311 ==> 08/2005
v312 ==> 07/2006
v321 ==> 12/2007
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