Thanks for the suggestion.
I first tried using Jl_cmder with the 'How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ.com'-instructions, but it didn't work as I couldn't connect to the BlackBerry, therefore I used the instructions from the 'What to do next if Jl Cmder will not connect and wipe - BlackBerryFAQ.com' tutorial, which worked.
Unfortunately, after resetting the settings, the issue was still there.
When entering the camera-mode, the phone will freeze up instantly and will either restart itself or I have to restart it by removing the battery.. any other suggestions, or is it time to start thinking about ¤sigh¤ giving up?