Cydia tweak for installing newer apps on older iOS versions?
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Go to where iTunes stores your IPAs for your Apps. Find the app, rename it App.zip (App being the name of the application), then unzip it. Open Payload. Find the Info.plist. (if you can't edit it, try putting the files on the iphone and editing the plist using iFile)
Edit the plist minimum OS version to be as low as your current firmware. (you might also need to edit some other OS number in the info.plist, just check out the entire thing first.)
Now go back to the payload folder and zip it up. change the name back to app.ipa.
You can now install this ipa using iFunBox or whatever way you like.
I had this problem before I upgraded from 4.2.1 to 5.0.1
I wanted to use My Xbox Live app, but they only let you use it on 4.3.
So I changed the info.plist and then it worked.
*Note iFile can edit Plists by default.
*Also some apps will not work after doing this, for example an app on 5.0 may be coded differently than on 4.0, thus it will not run as expected. In my situation I was getting a 4.0 app to work on a 4.0 OS, so this worked perfectly.
I'm editing WhatsApp so it can work on 4.2.1 (it requires 4.3). I unzipped it, edited info.plist using iFile then transferred it back to the Payload folder, and zipped it up like it was before. But when I try to install it using Installous, it says "Invalid IPA". When I try to install using iFunBox, it Fails..
What am I doing wrong?