Help to create or patch switching 3G to slot 2!(MIUI V7)

I`ve flashed my INEW V7 with MIUI V7 5.9.1 originaly created for HM NOTE 1W ported by some enthusiast.And i`ve faced a BIG problem!This MIUI version DOES NOT SUPPORT switching 3G (WCDMA) mode between 1-st and 2-nd slot!In stock version for INEW V7 1.0.4-1.1.0 this function is working perfect(for two years)!May i,somehow, fix this problem?Ingeneer mode of 2-nd sim does not allow to save changes to WCDMA,stayed in EDGE only...
I can`t download links,bucause i`m a new one

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