If you have ifile installed:
Open this link in safari on you iOS device:
http://cydiaupdates.net/pkg/mobilesubstrate
Then tap on the version number that is underlined it should start downloading the deb file. Then tap open in ifile in the top right corner. Then when it opens in ifile tap installer from the popup menu or tap on the file to bring up the popup menu.
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I don't have Ifile that's the big problem!
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