CAT B15 firmware need

HIBrand : CAT
ProdName : B15
ProdModel : B15
Device : TOUGH
AndroidVer: 4.1.2
MTKxCPU : MT6577
MTKxPRJ : ALPS.JB.MP.V1.26

MODEM :
BaseBand : MT6577_S00_MAUI_11AMD_W12_22_SP_V30@041

Need caterpillar b15 firmware . i found the infinity support but its downloading fail (size mismatch) . pls help

thanks

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