As you all know, Apple has introduced retina display with four times as many pixels on the same screen size in the iPhone 4. Many app developers have already converted their apps and icons to support retina display, but others might have never converted them at all. Now with the help of Cydia tweaks, you can do it yourself!

To be able to follow our steps, you need a jailbroken device, you can jailbreak your iOS 4.x device using the latest version of Redsn0w by following our guide posted here then simply follow the steps given below.

STEP 1: You will need those Cydia programs for free by tapping into Cydia from your Springboard and touch on Search then install the following apps: iRetiner, MobileTerminal, and Erica Utilities.

STEP 2: Once you install these three programs from Cydia, launch MobileTerminal on your springboard.

STEP 3: Type in the following commands in MobileTerminal:

su (then press enter)
alpine (press enter again)
iRetiner (enter once more)

For some compatibility issue, if the letters do not show up on the screen when you are typing your password, continue typing and just press enter.

STEP 4: Now, you should reach a screen that looks like this:

Select option one by typing in 1 and press enter again.

STEP 5: By now, let the apps process. Your screen on your iDevice should look something similar to this:

This shows that the apps are converting to retina display. Once you are done, on the bottom of the screen there should be two options telling you whether to respring or not. Type down y to respring. You are now finished!

In conclusion, the iRetiner does improve the icons a lot. I have tried it myself and I see a huge improvement, even on the blurry icons! This is a a neat trick, but when you get new apps, you need to repeat this process. Even though that is a pain, look on the bright side, your icons look so detailed!

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