models:
NVR2104-P-S2,NVR2104-S2,NVR2104HS-P-S2,NVR2104HS-S2,
NVR2108-8P-S2,NVR2108-S2,NVR2108HS-8P-S2,NVR2108HS-S2,
NVR2204-P-S2,NVR2204-S2,NVR2208-8P-S2,NVR2208-S2, 
NVR2116-S2, NVR2116HS-S2, NVR2216-S2


release note:
optimizations