iOS 5.0 [HOW TO] Spoof iOS 5.0.1 to look like 5.1

There were a bunch of apps released today for iOS 5.1, and everyone that wants a jailbreak doesn't want to update. Here's how I found to stay on 5.0.1 and be able to download the 5.1 apps.

Proven to work with:
iBooks update
iMovie update

Proven to NOT work with:
iPhoto (here's a Cydia fix, though)

What you'll need:

• Jailbroken device
• iFile, iFunBox, iExplorer, SSH, etc.
• Way to edit .plists
• MAKE BACKUPS OF ALL FILES

First, trick the App Store into thinking you're on iOS 5.1.
In the /System/Library/CoreServices/SystemVersion.plist, change

Code:

<key>ProductBuildVersion</key>
    <string>9A405</string>

to

Code:

<key>ProductBuildVersion</key>
    <string>9B176</string>

and

Code:

<key>ProductVersion</key>
    <string>5.0.1</string>

to

Code:

<key>ProductVersion</key>
    <string>5.1</string>

You may experience crashing and respringing through this process and get stuck in Safe Mode, that's more or less okay. SSHing/iFile still work.
In the /User/Library/Preferences/com.apple.springboard file, change

Code:

<key>SBSoftwareUpdateOSVersion</key>
    <string>5.0.1:9A405</string>

to

Code:

<key>SBSoftwareUpdateOSVersion</key>
    <string>5.1:9B176</string>

Now, respring. Then, (even if you're in Safe Mode) go and download your apps.

Second, trick the apps into thinking they can run on iOS 5.0.1 or lower.
Go into the filesystem of the app (folder names are randomly generated, use AppInfo or SBSettings or iFunBox to find the right folder) and find the app's Info.plist. Inside, change

Code:

<key>MinimumOSVersion</key>
    <string>5.1</string>

to

Code:

<key>MinimumOSVersion</key>
    <string>5.0.1</string>

If you aren't on iOS 5.0.1, change it to your current iOS version.

If you're still in Safe Mode at this point, go and undo the changes to SystemVersion.plist and com.apple.springboard and respring. If you're not in Safe Mode, feel free to leave those files alone and be on fake "iOS 5.1."

I wouldn't have a clue how, sorry. As long as you make backups, you should be fine.

Yeah, that's annoying. Waste of money, at this point. I wonder if it's the same problem as iBooks had with jailbroken devices.