subnet mask allways greyed out

ME102 latest software. I can change every thing but the subentmask. It is always

255.255.254.0. No matter what ip i give it Class A B C or D. subnet never changes.. I tried restoring to factory defaults. still 255.255.254.0. If i was using vslm would care. Netgear is no help. They say install snmp manager, DUHH Help Please
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