HDR Camera Enabler For iPhone 3GS, 3G iOS 4.1

Ever since iOS 4.1 has been released with some awesome features including HDR photos, every one has been wanting to upgrade to this free firmware update from Apple. However be aware that iOS 4.1 brings a baseband update 2.10.04 with which you end up losing your unlock.
Here is how you can update to iOS 4.1 without upgrading baseband (and thus preserve your unlock). Also you can jailbreak iOS 4.1 iPhone 3GS (old bootrom) and later unlock it with Ultrasn0w 1.1-1.
Now coming to HDR photography, this feature is integrated with iPhone 4 camera app. When you select HDR, 3 photos are taken one after the other, with different levels of light exposure and finally combined into one well exposed picture. Want this feature on your iPhone 3GS or 3G on iOS 4.1?
Here is how you can manually enable HDR photos in iPhone 3GS or 3G. Those of you who might be wanting a single click solution, a Cydia tweak by the name HDR Camera Enabler is now available in WinterBoard.