Updating a NT31 HMI to a NS5

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Hi everyone! I'm trying to update a NT31-ST122B_EV2 to a NS5-SQ10B-V2 but I'm having trouble converting the .mmi file (the one from the NT31) to an .ipp (for the CX-Designer) The utility that I'm using to convert the files is the support tool for convertion NT31C_631C, the one from the CX-Designer Tools. The convertion marks as OK but when I try to open the resulting file to the CX-Designer, it appears a message saying that the file is corrupted and if aI want to restore it. Even if I select YES or NO, I cannot see anything in the project, also I try to dowload it directly to the NS but nothing appears in the HMI. Is it possible to load it or convert the file in other way? Thanks for your respones.