I have just reflashed my phone's firmware, since I screwed it up (tried to apply quick access patch, but accidentally put firmware file in wrong section). Before the flash, everything was fine. Now, however, the main camera has some issues (front 3G camera is fine). Whenever I open it (either by opening the shutter or by pressing the camera button), the whole phone freezes. It freezes on the camera screen (with all the info as you would expect, but it doesn't display any image), so I have to pull out the battery and restart the phone. I've tried opening the camera application many times, only to be met with failure. The only "mod" I've done to the phone regarding the camera is installing Ultimate Camera Driver v2.0 Final Vivid Colour (http://www.esato.com/board/viewtopic.php?topic=161414&start=0). Any help on this issue would be greatly appreciated. Also, the firmware I'm using is K800 R8BA024 Hong Kong (I've used this file before, so I know it's not the problem).

*I just tried going into the service menu to see if it's a hardware problem. Everything works there. Went into camera under service tests and it works perfectly. However, camera application is still messed.

From what you say something's wrong with your camera driver file. So, please try to use a different camera driver (first try the original K800 or K810 camera drivers) and see if you get the camera to work or not.